Resolve "Changing feedback that a reviewer worken on is forbidden after set to final"

Closes #168 (closed)

changed milestone to %Korrekturtermin SoSe19

added Backend Bug priority:high labels

added 1 commit

• 7d9ef948 - Apply suggestion to core/serializers/feedback.py

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added 1 commit

• 6076f6de - Apply suggestion to core/serializers/feedback.py

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I have applied the suggestions for the user variable

added 1 commit

• b895a083 - fixed indentation

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added 6 commits

• 32561377 - 1 commit from branch master
• 1492d2f5 - added dedicated field for reviewer validation
• d45a5898 - put the final by reviewer logic in the serializer
• a18c5292 - Apply suggestion to core/serializers/feedback.py
• 4f78a555 - Apply suggestion to core/serializers/feedback.py
• 6191b785 - fixed indentation

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resolved all threads

enabled an automatic merge when the pipeline for 6191b785 succeeds

canceled the automatic merge

enabled an automatic merge when the pipeline for 6191b785 succeeds

merged