Fix BenderSampleData with slicer 4.3

Two things here:
First, add the SampleData as an ignored module automatically. This will
prevent the confusion between the Slicer's sample data and Bender's.
Secondly, initialize the logic ourselves, to prevent initializing the
SampleData's source dictionnary.
Merge branch 'FixBenderSampleData' into next

* FixBenderSampleData:
  Fix BenderSampleData with slicer 4.3