Last modified: 2014-11-17 10:36:25 UTC
Running r90927 of trunk and WikiLove with $wgWikiLoveGlobal set to "true" in my LocalSettings.php, I'm able to post WikiLove messages to the talk pages of unregistered users without any warning or prohibition. There should be at least a warning when attempting to post to the talk page of a user who isn't locally registered. An outright prohibition (not showing the little red heart) probably makes more sense than a warning for user accounts. It should remain possible to post to the talk page of an IP address, however.
Nice QAing on this. Agree this needs to be fixed.
Fixed in r90956. Thanks for the bug report!