vtkSIPythonSourceProxy: redirect exception text to logging
When a Python proxy fails to be created, we use PyErr_Print()
(in SafePyErrorPrintAndClear
) which gets lost in most UI environments. Instead, get the text and put it into the normal logging pipeline.
Discourse: https://discourse.paraview.org/t/failed-to-create-object-error/11702
Cc: @cory.quammen