Catch RuntimeError also in qt resources import

Python 3 generates an RuntimeError regarding the mix of PyQt4/PyQt5
rather than an ImportError from IPython in Python 2.

scripts/ErrorReporter/errorreport.py

@@ -9,7 +9,7 @@ from qtpy.QtCore import Signal
 
 try:
     from ErrorReporter import resources_qt5 # noqa
-except ImportError:
+except (ImportError, RuntimeError):
     from ErrorReporter import resources_qt4 # noqa
 
 from mantidqt.utils.qt import load_ui