silx view: exception for virtual source

[woutdenolf]

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When clicking on a virtual dataset I get the exception <class 'AttributeError'> 'str' object has no attribute 'pop'

ERROR:silx.gui.qt._qt:<class 'AttributeError'> 'str' object has no attribute 'pop'   File "/usr/lib/python3/dist-packages/silx/gui/data/Hdf5TableView.py", line 273, in data
    value = value(self.__obj)
  File "/usr/lib/python3/dist-packages/silx/gui/data/Hdf5TableView.py", line 457, in _first_source
    firstExtSource.pop(0)