ApiWikiLove: Don't pass null to implode(), but fall back to []
ApiWikiLove: Don't pass null to implode(), but fall back to []

Bug: T241094
Change-Id: I1525d8fa9f82a0d8337d66aa233e485cce8ed842

wikimedia/mediawiki-extensions-WikiLove,wikimedia/mediawiki-extensions-WikiLove