Fix code is None in CodeExercise with ExerciseRegistry #57
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When the code is None in the CodeExercise and a ExerciseRegistry is given, then an error is raised when the save cue box is created, because the cue_widget is None. Since the cue widgets are set later on, we use a dummy widget on initialization with is later replaced.
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When the code is None in the CodeExercise and a ExerciseRegistry is given, then an error is raised when the save cue box is created, because the cue_widget is None. Since the cue widgets are set later on, we use a dummy widget on initialization with is later replaced.
📚 Documentation preview 📚: https://scicode-widgets--57.org.readthedocs.build/en/57/