Editor crashes with KeyError on block parameters

Traceback (most recent call last):
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/assetwidget.py", line 507, in loadAsset
    self.__update_content(declaration)
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/assetwidget.py", line 234, in __update_content
    self.__updateJsonWidget()
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/assetwidget.py", line 319, in __updateJsonWidget
    self.json_widget.setText(self.current_editor.dump_as_string())
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/editor.py", line 299, in dump_as_string
    self.dump_json(), sort_keys=True, indent=4, cls=utils.NumpyJSONEncoder
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/editor.py", line 292, in dump_json
    json_data.update(self._dump_json())
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/experimenteditor.py", line 1435, in _dump_json
    __filter_parameters(item, globals_)
  File "miniconda/envs/iris/lib/python3.7/site-packages/beat/editor/widgets/experimenteditor.py", line 1411, in __filter_parameters
    block_parameters[parameter_name]
KeyError: 'useBestGuess'

To reproduce:

• use this prefix: https://filesender.switch.ch/filesender/?vid=59e1dbc9-04e4-67c8-2bb1-00007d77b3bb
• start beat editor
• open this experiment:

├── experiments
│   └── jmcgrat3
│       └── jmcgrat3
│           └── livdet-baseline
│               └── 1
│                   └── livdet-baseline.json