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Fix DuplicateKeyException in DefaultEntityServiceImpl

Daniel Gerhardt requested to merge fix-entity-service-duplicate-key-exception into master

An exception was thrown when a list entity IDs with duplicates was resolved from cache in DefaultEntityServiceImpl.get(Iterable<String> ids). Duplicate IDs are now filtered.

This previously could lead to errors in user answering stats calculation when a content group contained duplicate content IDs. This is not supported but the creation of such groups is currently not prevented on the backend side.

Fixes: #177 (closed)
Related: #148 (closed)

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