Mattermost Server panic on compliance export
Description
Environment
Mattermost Server: 5.20.1
Steps to Reproduce
1. Run a compliance export
Expected Behavior
Compliance export runs successfully or fails with an error
Observed Behavior
Mattermost server crashes, and all servers in the cluster need to be restarted to restore functionality
No errors are output to mattermost.log but sudo journalctl -u mattermost.service --since "2020-03-9 23:45:00" > /tmp/mattermost.log outputs this:
Full details available in the Sustained Engineering channel here
QA Test Steps
This is a bit difficult to test, because it depends on certain conditions to be satisfied for it to reproduce. A unit test is ideal for this, which is already included in the PR.
To confirm this does not introduce a regression, any testing around the compliance job would suffice.
Activity
Tested and Passed on 5.21-rc3
No crashes or errors - Compliance export runs successfully.
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Tested and Passed on 5.20.2
Compliance export runs successfully, no errors or crashes
(Waiting for 5.21-rc3 to be updated for testing)
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