Remove vtkPythonScopeGilEnsurer from checkForPythonError
Remove vtkPythonScopeGilEnsurer from checkForPythonError

In order to be able to get the trace back PyErr_Occurred must
be called in the same lock of the GIL. So checkForPythonError
is now called with the GIL already locked.

thewtex/tomviz,cjh1/tomviz,thewtex/tomviz,OpenChemistry/tomviz,cryos/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,mathturtle/tomviz,thewtex/tomviz,mathturtle/tomviz,OpenChemistry/tomviz,cjh1/tomviz,OpenChemistry/tomviz,cryos/tomviz,cjh1/tomviz,cryos/tomviz