gitlabconnection.py: Handle 404 on unapprove
Handle a 404 response when attempting to unapprove an MR which does not have an existing approval.
Change-Id: Ia000b55e28c9628cf97682939215430baa78d065
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
Handle a 404 response when attempting to unapprove an MR which does not have an existing approval.
Change-Id: Ia000b55e28c9628cf97682939215430baa78d065