Description
I'm on Panel 1.3.0 and Param 2.0 trying to refresh my understanding of the Location object https://panel.holoviz.org/how_to/state/url.html
When I try to create a small app from the example I get bokeh.core.property.descriptors.UnsetValueError: Slider(id='p1105', ...).value doesn't have a value set.
import param
import panel as pn
class QueryExample(param.Parameterized):
integer = param.Integer(default=None, bounds=(0, 10))
string = param.String(default='A string')
query_example = QueryExample()
pn.state.location.sync(QueryExample(), {'integer': 'int', 'string': 'str'})
pn.Param(query_example).servable() File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/has_props.py", line 599, in properties_with_values
return self.query_properties_with_values(lambda prop: prop.serialized,
File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/has_props.py", line 656, in query_properties_with_values
value = descriptor.get_value(self)
File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/property/descriptors.py", line 394, in get_value
return self.__get__(obj, obj.__class__)
File "/home/jovyan/repos/my-repo/.venv/lib/python3.10/site-packages/bokeh/core/property/descriptors.py", line 283, in __get__
raise UnsetValueError(f"{obj}.{self.name} doesn't have a value set")
bokeh.core.property.descriptors.UnsetValueError: Slider(id='p1105', ...).value doesn't have a value setIf I change the integer value to 1 the example works.
I believe this is a bug and that pn.Param should pick another widget to support the None value.