Merge branch 'ticket/10945' into ticket/10945-develop

* ticket/10945:
  [ticket/10945] Fix return values for split_keywords function
  [ticket/10945] Display search query when search fails in native search
  [ticket/10945] remove trigger_error call

Conflicts:
	phpBB/phpbb/search/fulltext_native.php
[ticket/10945] Remove mark test incomplete for mysql and postgres

PHPBB3-10945
[ticket/10945] Fix Unit Tests as per new changes to split_keywords

PHPBB3-10945
[ticket/10945] Remove mark test incomplete for native search backend

PHPBB3-10945