Exception raised in _ce_sender thread

[twmr]

There are a couple of uncaught exceptions output by pytest, e.g.,

tests/test_gem_equipment_handler.py::TestGemEquipmentHandler::testControlInitialStateOnlineLocal
  /home/runner/work/secsgem/secsgem/.venv/lib/python3.12/site-packages/_pytest/threadexception.py:73: PytestUnhandledThreadExceptionWarning: Exception in thread Thread-2 (_ce_sender)
  
  Traceback (most recent call last):
    File "/opt/hostedtoolcache/Python/3.12.2/x64/lib/python3.12/threading.py", line 1073, in _bootstrap_inner
      self.run()
    File "/opt/hostedtoolcache/Python/3.12.2/x64/lib/python3.12/threading.py", line 1010, in run
      self._target(*self._args, **self._kwargs)
    File "/home/runner/work/secsgem/secsgem/secsgem/gem/collection_event_capability.py", line 124, in _ce_sender
      if ceid in self._registered_collection_events and self._registered_collection_events[ceid].enabled:
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  AttributeError: 'GemEquipmentHandler' object has no attribute '_registered_collection_events'. Did you mean: 'registered_collection_events'?
  
    warnings.warn(pytest.PytestUnhandledThreadExceptionWarning(msg))

I guess that there is a super().__init__() call missing somewhere.