[PyQt] uic fails to generate code with QUndoView

[Ivan Sinkarenko]

Hi Phil,

I've noticed that PyQt (5.12-5.14 at least) fails to generate code from 
*.ui files containing QUndoView.
The problem seems to be in pyuic/uic/Compiler/qtproxies.py missing the 
declaration of the class, e.g. "QUndoView(QListView): pass".
Adding the declaration fixes the problem.

I tested it with pyuic5, but I image that uic.loadUi() should be 
affected as well.

Cheers,
Ivan