Wrap feedback average calculation in Optional type
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- src/main/java/de/thm/arsnova/model/Feedback.java 8 additions, 8 deletionssrc/main/java/de/thm/arsnova/model/Feedback.java
- src/main/java/de/thm/arsnova/service/FeedbackServiceImpl.java 2 additions, 10 deletions...main/java/de/thm/arsnova/service/FeedbackServiceImpl.java
- src/test/java/de/thm/arsnova/model/FeedbackTest.java 5 additions, 4 deletionssrc/test/java/de/thm/arsnova/model/FeedbackTest.java
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