Importing Philips Digital Diagnost DX images fails with multiple filters

As reported by Mark Pearce on the google groups:
Traceback (most recent call last): 
  File "/usr/local/bin/openrem_dx.py", line 24, in <module> 
    dx(filename) 
  File "/usr/local/lib/python2.7/dist-packages/celery/local.py", line 191, in __call__ 
    return self._get_current_object()(*a, **kw) 
  File "/usr/local/lib/python2.7/dist-packages/celery/app/task.py", line 380, in __call__ 
    return self.run(*args, **kwargs) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 815, in dx 
    _dx2db(dataset) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 714, in _dx2db 
    _generalstudymoduleattributes(dataset, g) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 621, in _generalstudymoduleattributes 
    _projectionxrayradiationdose(dataset, g, ch) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 443, in _projectionxrayradiationdose 
    _irradiationeventxraydata(dataset, proj, ch) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 404, in _irradiationeventxraydata 
    _irradiationeventxraysourcedata(dataset, event) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 281, in _irradiationeventxraysourcedata 
    _xray_filters_prep(dataset, source) 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 164, in _xray_filters_prep 
    xray_filter_thickness_minimum, source 
  File "/usr/local/lib/python2.7/dist-packages/openrem/remapp/extractors/dx.py", line 71, in _xrayfilters 
    if material.strip().lower() == 'molybdenum': 
AttributeError: 'MultiValue' object has no attribute 'strip'
Error confirmed on my install.
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