Fix nil error in Gitlab:Auth:IpRateLimiter (!203381) · Merge requests · GitLab.org / GitLab

What does this MR do and why?

Fix nil error in Gitlab:Auth:IpRateLimiter

In !196981 (merged) we changed the implementation to properly handle mapped IPv6 addresses but accidentally broke handling of nil entries by moving a compact call.

We fixed something similar for trusted proxies in !202656 (merged).

Closes #566636 (closed)

Relates #565044 (closed)

Changelog: fixed

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