What does this MR do?
Upgrades the mail_room gem from 0.8.0 to 0.8.1.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
mail_room throws an exception if the watching script joins a undefined thread. Release 0.8.1 adds a check to ensure that the thread exists before calling join.
Does this MR meet the acceptance criteria?
CHANGELOG entry added
API support added
Added for this feature/bug
All builds are passing
Conform by the merge request performance guides
Conform by the style guides
Branch has no merge conflicts with
master(if you do - rebase it please)
Squashed related commits together
What are the relevant issue numbers?
Fixes omnibus-gitlab#1619 (closed).