plotlywidget/extension reports problems when enabled #29

Bug Report

In the development version of MIPTools, the notebook extension plotlywidget/extension reports problems. The extension still appears to be enabled (by checking jupyter nbextension list), however, there may be problems when trying to use this extension within any notebooks.

Reprex

The reprex provided here shows the message when running within the Singularity shell. This message also appears when trying to run the jupyter app.

$ singularity shell miptools_v0.4.0.sif

Singularity> jupyter nbextension enable plotlywidget/extension

#> Enabling notebook extension plotlywidget/extension...
#>       - Validating: problems found:
#>         - require?  X plotlywidget/extension