[ticket/11686] Not checking for phpBB Debug errors on functional tests

PHPBB3-11686
Merge remote-tracking branch 'github-exreaction/ticket/11686' into develop-olympus

* github-exreaction/ticket/11686:
  [ticket/11686] Not checking for phpBB Debug errors on functional tests
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11686] Not checking for phpBB Debug errors on functional tests