Creating a new Stream when already at max streams allowed by license causes a KeyError to be raised

[BryceBeagle]

Traceback (most recent call last):
  File "/snap/brainframe-client/97/usr/local/lib/python3.6/site-packages/brainframe_qt/ui/resources/qt_async_worker.py", line 63, in finish
    raise self.err
  File "/snap/brainframe-client/97/usr/local/lib/python3.6/site-packages/brainframe_qt/ui/resources/qt_async_worker.py", line 47, in run
    self.data = self.func(*self.f_args, **self.f_kwargs)
  File "/snap/brainframe-client/97/usr/local/lib/python3.6/site-packages/brainframe_qt/api_utils/streaming/stream_manager.py", line 52, in delete_stream
    self.stop_streaming(stream_id)
  File "/snap/brainframe-client/97/usr/local/lib/python3.6/site-packages/brainframe_qt/api_utils/streaming/stream_manager.py", line 81, in stop_streaming
    self._stop_stream(stream_id)
  File "/snap/brainframe-client/97/usr/local/lib/python3.6/site-packages/brainframe_qt/api_utils/streaming/stream_manager.py", line 173, in _stop_stream
    stream_reader = self.stream_readers[stream_id]
KeyError: 116