BUG: getLoadablesFromFileLists was expecting a list of tuples only
- it could also be a list of lists
Here is a list of tuples produced: https://github.com/Slicer/Slicer/blob/fce63b47161baecc320672e93b879c0e08d3ed9a/Modules/Scripted/DICOMLib/DICOMWidgets.py#L640-L659
Here is a list of lists produced: https://github.com/Slicer/Slicer/blob/fce63b47161baecc320672e93b879c0e08d3ed9a/Modules/Scripted/DICOMLib/DICOMWidgets.py#L766-L781