phpbb/phpbb3 — pull request #1235 by erangamapa (2013-02-18 05:57:02+00:00)
Title: [ticket/11358] Success message even without selecting a user.

In group membership management, if you perform the action
'Make group default for member' without selecting any user,
a confirm box will be displayed and will show a success
message after confirming. Added a new condition to fix this
issue in acp_groups.php. It will check weather any users are
selected before performing above action.

PHPBB3-11358