TestEmptyInput skips some classes

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

TestEmptyInput uses this test to decide whether a class should be tested for empty input:

{[b IsA "vtkAlgorithm"] && ! [b IsA "vtkBMPReader"] && ! [b IsA "vtkImageExport"] && ! [b IsA "vtkOpenGLTexture"]}

This is because the vtkBMPReader, vtkImageExport, and vtkOpenGLTexture classes fail the test. These should be fixed.