top adjoint doesn't work in bokeh

[majidaldo]

import holoviews as hv
hv.notebook_extension('bokeh')
hv.AdjointLayout([hv.Curve([0,1,1,2,3]), hv.Empty() ,hv.Curve([0,1,1,0,1])])

flawed with mpl backend but with bokeh it's not even trying.

[philippjfr]

We never tested AdjointLayouts with empty plots, this could be a HoloViews issue but it might very well be the bokeh layout solver getting into a weird state. Will have to investigate.

[philippjfr]

This has been fixed by the PR referenced above. Please reopen if you encounter any other issues.