fix: Check for null before attempting ->getRelations() #3382
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Follows up on flarum/mentions#79
With this implementation, when a 3rd party extension uses the renderer for a user mention, and does not pass any
context, an error occurs:Call to a member function getRelations() on null in /opt/flarum/vendor/flarum/mentions/src/Formatter/FormatUserMentions.php:48This is because
issetdoes not first check that$contextis not null, before attempting to evaluate->getRelations()This PR looks to address this. Locally tested.