Misattribution of import errors

[bradezard131]

A failure to import IPython and matplotlib is falsely attributed to a a failure to import ipywidgets. Matplotlib is not a requirement for fastprogress and so this is an easy error to cause but requires source-code delving to debug.
https://github.com/fastai/fastprogress/blob/e7d108f5906ed9ab8d90502ec8b6d0253bd0e3db/fastprogress/fastprogress.py#L97-L103

[seeM]

Just ran into this as well. In my case I was missing matplotlib. A simple fix would be to reword the error message. Nicer would be to enable as much functionality as possible without matplotlib if it doesn't exist. Not sure how much work that would need though.