Race condition in Helm repositories

There is a possibility of a race condition in Helm repositories, with the same behavior as this JIRA.

When 2 deployments happen concurrently to the same Helm local repo, then it might occur that:
1. First deploy triggered indexing
2. Second deploy started, and added itself to the event queue, but didn't commit to the db yet
3. In the same millisecond, the indexing started going over the queue. The event was there but did not commit yet, so it failed.

This is the error:

2019-11-11 12:24:35,017 [art-exec-2344321] [ERROR] (o.j.r.h.HelmMetadataExtractor:53) - Error while extracting metadata from chart: Failed to retrieve resource helm-local:test-chart-2-0.0.1.tgz: Could not get resource stream. Path 'test-chart-2-0.0.1.tgz' not found in helm-local