def RemoveMapping(self, filename):
    if filename in self._file_mapping:
      del self._file_mapping[filename]
Checks if the user have canceled the execution and takes
dataset/ETHPy150Open google/transitfeed/transitfeed/gtfsfactory.py/GtfsFactory.RemoveMapping--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/pipeline_view.py/QPipelineScene.check_progress_canceled