Property name missing in error message

This error message should be improved:

from GaudiConfig2.Configurables import PropertyAlg
alg = PropertyAlg()
alg.StringArray = [3]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/scratch/fwinkl/Gaudi/src/GaudiConfiguration/python/GaudiConfig2/_configurables.py", line 61, in __set__
    instance._properties[self.name] = self.semantics.store(value)
  File "/scratch/fwinkl/Gaudi/src/GaudiConfiguration/python/GaudiConfig2/semantics.py", line 360, in store
    new_value.extend(value)
  File "/scratch/fwinkl/Gaudi/src/GaudiConfiguration/python/GaudiConfig2/semantics.py", line 340, in extend
    self.data.extend(self.value_semantics.store(value) for value in iterable)
  File "/scratch/fwinkl/Gaudi/src/GaudiConfiguration/python/GaudiConfig2/semantics.py", line 340, in <genexpr>
    self.data.extend(self.value_semantics.store(value) for value in iterable)
  File "/scratch/fwinkl/Gaudi/src/GaudiConfiguration/python/GaudiConfig2/semantics.py", line 134, in store
    raise ValueError("cannot set property {} to {!r}".format(self.name, value))
ValueError: cannot set property None to 3

We are somehow no propagating the property name. There is this obvious bug in semantics but fixing that by itself doesn't help.