Fix warning in football acp manage team page

acp/teams_module.php

@@ -189,7 +189,10 @@ class teams_module
 
 			foreach( $files as $file ) 
 			{
+                $selected = '';
+                if (isset($team_row) && is_array($team_row)) {
                     $selected = (strtoupper($file) == strtoupper($team_row['team_symbol'])) ? ' selected="selected"' : '';
+                }
 				$teamsymbol_options .= '<option value="' . $file . '"' . $selected . '>' . $file . '</option>';
 			}
 			closedir($directory);