Fix get_managed_event!/2 for events with no leaders
#194
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This PR is a quick fix for a bug I spotted just now in development. If you try to check the report for a finished event with no leaders, as the owner of that event, you currently raise an exception. As far as I can tell, this is because the query I wrote for
Events.get_managed_event!/2is producing an empty set when joining with activity leaders. So even though you're the owner of the event, no event is returned in that query. Doing a left join fixes this. Sorry for that!