Check for `user_nicename` when meetup organisers are added

[hlashbrooke]

When we add the usernames of meetup group organisers in the meetup tracker (​https://central.wordcamp.org/wp-admin/edit.php?post_type=wp_meetup), the system checks if it is a valid username by checking against the user_login field. This is fine in most cases, but in some instances the username supplied is actually the user_nicename as it is copied from the profile URL.

When that happens, the only solution is to ask in the #meta channel on Slack if someone can help with providing the username from the given nicename. That is obviously not ideal.

The simplest solution here would be to add a secondary check to match the provided username against the user_nicename field if the initial check against the user_login field fails. This check is only run at the time that the meetup listing is saved, so any processing overhead created by an additional check wouldn't be a problem.

[iandunn]

+1, see slack conversation linked above for notes

[dd32]

In 9373:

Trac: Github PRs: Add some initial code to sync a PR Comment (Not a code review comment..) over to Trac for visibility.

This isn't yet active, as Github isn't sending the issue_comment action yet.

See #4093.

[ryelle]

Fixed in ​git commit 92c0c72