error in --process when calculating Tm_total if source instances and outputs are given

example Self_DualLoop1_multiloop:
Traceback (most recent call last):
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt.py", line 79, in <module>
    run()
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt/util.py", line 149, in wrapped_f
    res = f(*args, **kwargs)
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt.py", line 78, in run
    gnt_common(args)
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt.py", line 41, in gnt_common
    args.func(args)
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt.py", line 56, in gnt_process
    calc()
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt/util.py", line 149, in wrapped_f
    res = f(*args, **kwargs)
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt.py", line 54, in calc
    Hmat.calculate_values()
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt/determinant_expr.py", line 97, in calculate_values
    self.value
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt/util.py", line 45, in __get__
    val = self.fget(obj)
  File "/home/design/jverbrug/git/gnt/src/rev5/python/gnt/determinant_expr.py", line 91, in value
    logger.debug('Calculating value of {:s}'.format('.'.join(self.hierarchical_name)))
TypeError: sequence item 0: expected string, NoneType found
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