.options(multi_y=True) can raise strange exceptions

[douglas-raillard-arm]

ALL software version info

holoviews==1.19.1
bokeh==3.4.2
jupyterlab==4.2.3
firefox==127.0.2
python==3.12

Description of expected behavior and the observed behavior

This code should raise the following exception:

ValueError: Unexpected option 'multi_y' for Curve type across all extensions. Similar options for current extension ('bokeh') are: ['multi_y'].

Complete, minimal, self-contained example code that reproduces the issue

import holoviews as hv
hv.extension('bokeh')
hv.Curve([1,2]).options(multi_y=True)

Stack traceback and/or browser JavaScript console output

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
File venv/lib/python3.12/site-packages/IPython/core/formatters.py:977, in MimeBundleFormatter.__call__(self, obj, include, exclude)
    974     method = get_real_method(obj, self.print_method)
    976     if method is not None:
--> 977         return method(include=include, exclude=exclude)
    978     return None
    979 else:

File venv/lib/python3.12/site-packages/holoviews/core/dimension.py:1275, in Dimensioned._repr_mimebundle_(self, include, exclude)
   1268 def _repr_mimebundle_(self, include=None, exclude=None):
   1269     """
   1270     Resolves the class hierarchy for the class rendering the
   1271     object using any display hooks registered on Store.display
   1272     hooks.  The output of all registered display_hooks is then
   1273     combined and returned.
   1274     """
-> 1275     return Store.render(self)

File venv/lib/python3.12/site-packages/holoviews/core/options.py:1428, in Store.render(cls, obj)
   1426 data, metadata = {}, {}
   1427 for hook in hooks:
-> 1428     ret = hook(obj)
   1429     if ret is None:
   1430         continue

File venv/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:287, in pprint_display(obj)
    285 if not ip.display_formatter.formatters['text/plain'].pprint:
    286     return None
--> 287 return display(obj, raw_output=True)

File venv/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:255, in display(obj, raw_output, **kwargs)
    253 elif isinstance(obj, (CompositeOverlay, ViewableElement)):
    254     with option_state(obj):
--> 255         output = element_display(obj)
    256 elif isinstance(obj, (Layout, NdLayout, AdjointLayout)):
    257     with option_state(obj):

File venv/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:149, in display_hook.<locals>.wrapped(element)
    147 try:
    148     max_frames = OutputSettings.options['max_frames']
--> 149     mimebundle = fn(element, max_frames=max_frames)
    150     if mimebundle is None:
    151         return {}, {}

File venv/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:195, in element_display(element, max_frames)
    192 if type(element) not in Store.registry[backend]:
    193     return None
--> 195 return render(element)

File venv/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:76, in render(obj, **kwargs)
     73 if renderer.fig == 'pdf':
     74     renderer = renderer.instance(fig='png')
---> 76 return renderer.components(obj, **kwargs)

File venv/lib/python3.12/site-packages/holoviews/plotting/renderer.py:396, in Renderer.components(self, obj, fmt, comm, **kwargs)
    394 embed = (not (dynamic or streams or self.widget_mode == 'live') or config.embed)
    395 if embed or config.comms == 'default':
--> 396     return self._render_panel(plot, embed, comm)
    397 return self._render_ipywidget(plot)

File venv/lib/python3.12/site-packages/holoviews/plotting/renderer.py:403, in Renderer._render_panel(self, plot, embed, comm)
    401 doc = Document()
    402 with config.set(embed=embed):
--> 403     model = plot.layout._render_model(doc, comm)
    404 if embed:
    405     return render_model(model, comm)

File venv/lib/python3.12/site-packages/panel/viewable.py:735, in Viewable._render_model(self, doc, comm)
    733 if comm is None:
    734     comm = state._comm_manager.get_server_comm()
--> 735 model = self.get_root(doc, comm)
    737 if self._design and self._design.theme.bokeh_theme:
    738     doc.theme = self._design.theme.bokeh_theme

File venv/lib/python3.12/site-packages/panel/layout/base.py:319, in Panel.get_root(self, doc, comm, preprocess)
    315 def get_root(
    316     self, doc: Optional[Document] = None, comm: Optional[Comm] = None,
    317     preprocess: bool = True
    318 ) -> Model:
--> 319     root = super().get_root(doc, comm, preprocess)
    320     # ALERT: Find a better way to handle this
    321     if hasattr(root, 'styles') and 'overflow-x' in root.styles:

File venv/lib/python3.12/site-packages/panel/viewable.py:666, in Renderable.get_root(self, doc, comm, preprocess)
    664 wrapper = self._design._wrapper(self)
    665 if wrapper is self:
--> 666     root = self._get_model(doc, comm=comm)
    667     if preprocess:
    668         self._preprocess(root)

File venv/lib/python3.12/site-packages/panel/layout/base.py:185, in Panel._get_model(self, doc, root, parent, comm)
    183 root = root or model
    184 self._models[root.ref['id']] = (model, parent)
--> 185 objects, _ = self._get_objects(model, [], doc, root, comm)
    186 props = self._get_properties(doc)
    187 props[self._property_mapping['objects']] = objects

File venv/lib/python3.12/site-packages/panel/layout/base.py:167, in Panel._get_objects(self, model, old_objects, doc, root, comm)
    165 else:
    166     try:
--> 167         child = pane._get_model(doc, root, model, comm)
    168     except RerenderError as e:
    169         if e.layout is not None and e.layout is not self:

File venv/lib/python3.12/site-packages/panel/pane/holoviews.py:429, in HoloViews._get_model(self, doc, root, parent, comm)
    427     plot = self.object
    428 else:
--> 429     plot = self._render(doc, comm, root)
    431 plot.pane = self
    432 backend = plot.renderer.backend

File venv/lib/python3.12/site-packages/panel/pane/holoviews.py:525, in HoloViews._render(self, doc, comm, root)
    522     if comm:
    523         kwargs['comm'] = comm
--> 525 return renderer.get_plot(self.object, **kwargs)

File venv/lib/python3.12/site-packages/holoviews/plotting/bokeh/renderer.py:68, in BokehRenderer.get_plot(self_or_cls, obj, doc, renderer, **kwargs)
     61 @bothmethod
     62 def get_plot(self_or_cls, obj, doc=None, renderer=None, **kwargs):
     63     """
     64     Given a HoloViews Viewable return a corresponding plot instance.
     65     Allows supplying a document attach the plot to, useful when
     66     combining the bokeh model with another plot.
     67     """
---> 68     plot = super().get_plot(obj, doc, renderer, **kwargs)
     69     if plot.document is None:
     70         plot.document = Document() if self_or_cls.notebook_context else curdoc()

File venv/lib/python3.12/site-packages/holoviews/plotting/renderer.py:239, in Renderer.get_plot(self_or_cls, obj, doc, renderer, comm, **kwargs)
    236     defaults = [kd.default for kd in plot.dimensions]
    237     init_key = tuple(v if d is None else d for v, d in
    238                      zip(plot.keys[0], defaults))
--> 239     plot.update(init_key)
    240 else:
    241     plot = obj

File venv/lib/python3.12/site-packages/holoviews/plotting/plot.py:956, in DimensionedPlot.update(self, key)
    954 def update(self, key):
    955     if len(self) == 1 and key in (0, self.keys[0]) and not self.drawn:
--> 956         return self.initialize_plot()
    957     item = self.__getitem__(key)
    958     self.traverse(lambda x: setattr(x, '_updated', True))

File venv/lib/python3.12/site-packages/holoviews/plotting/bokeh/element.py:2109, in ElementPlot.initialize_plot(self, ranges, plot, plots, source)
   2107 # Initialize plot, source and glyph
   2108 if plot is None:
-> 2109     plot = self._init_plot(key, style_element, ranges=ranges, plots=plots)
   2110     self._populate_axis_handles(plot)
   2111 else:

File venv/lib/python3.12/site-packages/holoviews/plotting/bokeh/element.py:908, in ElementPlot._init_plot(self, key, element, plots, ranges)
    906     if not bokeh32:
    907         self.param.warning('Independent axis zooming for multi_y=True only supported for Bokeh >=3.2')
--> 908     yaxes, extra_axis_specs = self._create_extra_axes(plots, subplots, element, ranges)
    909     axis_specs['y'].update(extra_axis_specs)
    910 else:

File venv/lib/python3.12/site-packages/holoviews/plotting/bokeh/element.py:835, in ElementPlot._create_extra_axes(self, plots, subplots, element, ranges)
    833 ax_specs, yaxes, dimensions = {}, {}, {}
    834 subcoordinate_axes = 0
--> 835 for el, (sp_key, sp) in zip(element, self.subplots.items()):
    836     ax_dims = sp._get_axis_dims(el)[:2]
    837     if sp.invert_axes:

AttributeError: 'NoneType' object has no attribute 'items'

Screenshots or screencasts of the bug in action

• I may be interested in making a pull request to address this