Make Linter happy

Signed-off-by: Fredo Erxleben <f.erxleben@hzdr.de>

hifis_surveyval/models/question.py

@@ -181,7 +181,6 @@ class Question(
                 If answer options were present, but none of the answer options
                 had an ID that matched the given value
         """
-
         if not value:
             # Convert empty strings to None to properly indicate that no
             # data was provided

hifis_surveyval/models/question_collection.py

@@ -77,7 +77,7 @@ class QuestionCollection(
         text: Translated,
         label: str,
         questions: List[Question],
-        mandatory:bool,
+        mandatory: bool,
         settings: Settings,
     ) -> None:
         """