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. Due to spam, new accounts are locked until approved by an admin or the approver bot. Your GitLab account gets automatically approved within one hour if you are a member of Trusted Contributors in Gerrit, or a member of the Trusted-Contributors group in Phabricator and linked your Developer account to your Phabricator account. If none of these apply, you can 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