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Handle DuplicateKeyException for answer stats

Daniel Gerhardt requested to merge fix-answer-stats-duplicate-key-exception into master

The creation of duplicate answers is already prevented but duplicates might exist in data from earlier versions (there is no migration to remove duplicates). When duplicates occured during generation of AnswerStatisticsUserSummary, a DuplicateKeyException was thrown. Duplicates answers are now ignored.

Related: #148 (closed), !493 (merged)

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