serendipity_event_freetag: uninitialized array

[bauigel]

Seems there is an uninitialized array in the code which breaks the rss-feed

Around line 693

$eventData['display_dat'] .= $this->getFeedXmlForTags('category', $eventData['properties']['freetag_tags'] ?? []);

Changed it to following (thanks to ChatGPT) and it seems to work (for me)

$eventData['display_dat'] = ($eventData['display_dat'] ?? '') . $this->getFeedXmlForTags('category', $eventData['properties']['freetag_tags'] ?? []);

[onli]

Your proposed fix looks perfectly fine to me. There is a second occurrence of that array access a bit below, I fixed it equally. s9y/additional_plugins#171 is the PR, could you give it a test?