[ticket/17391] Fix PHP warning on creating group with the name already in use

PHPBB-17391

Author: rxu

phpBB/includes/acp/acp_groups.php

@@ -396,7 +396,7 @@ function main($id, $mode)
 					$allow_desc_urls	= $request->variable('desc_parse_urls', false);
 					$allow_desc_smilies	= $request->variable('desc_parse_smilies', false);
 
-					$submit_ary = array(
+					$submit_ary = [
 						'colour'			=> $request->variable('group_colour', ''),
 						'rank'				=> $request->variable('group_rank', 0),
 						'receive_pm'		=> isset($_REQUEST['group_receive_pm']) ? 1 : 0,
@@ -406,7 +406,13 @@ function main($id, $mode)
 						'max_recipients'	=> $request->variable('group_max_recipients', 0),
 						'founder_manage'	=> 0,
 						'skip_auth'			=> $request->variable('group_skip_auth', 0),
-					);
+
+						// Initialize avatar data
+						'avatar'			=> $avatar_data['avatar'] ?? '',
+						'avatar_type'		=> $avatar_data['avatar_type'] ?? '',
+						'avatar_height'		=> $avatar_data['avatar_height'] ?? 0,
+						'avatar_width'		=> $avatar_data['avatar_width'] ?? 0,
+					];
 
 					if ($user->data['user_type'] == USER_FOUNDER)
 					{