Fixed a minor bug which popped in the mixin removal process
Fixed a minor bug which popped in the mixin removal process

We didn't catch this because we don't have any Event-Based QA tests *look of disapproval*


Former-commit-id: ecc2486ca8acbcdddd58f076145508b960097e9b [formerly 491108f38281afdc6f07b8504ffb7f383ff53730]
Former-commit-id: 76d9202e1cbfce007faf6252b472610cd49dfa6a
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine