Catch JSONDecodeError in wiki.py
https://sentry.fsmpi.rwth-aachen.de/protokollsystem/protokollsystem/issues/7/
JSONDecodeError: Expecting value: line 1 column 1 (char 0)
(5 additional frame(s) were not displayed)
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File "program/wiki.py", line 120, in do_action
return req.json()
File "requests/models.py", line 892, in json
return complexjson.loads(self.text, **kwargs)
File "json/__init__.py", line 319, in loads
return _default_decoder.decode(s)
File "json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "json/decoder.py", line 357, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
JSONDecodeError: Expecting value: line 1 column 1 (char 0)