[NBM] Step 7: Add functionalities subscribe/unsubscribe:

  o reduce length of check_key
  o fix bugs
  o send mail on subscribe/unsubscribe
  o add and used $conf parameters
  o review keyword of languages
  o improve selection/check
  o can subscribe/unsubscribe with a link include on mail
  o fix bug mass_update collate




git-svn-id: http://piwigo.org/svn/trunk@1116 68402e56-0260-453c-a942-63ccdbb3a9ee

Author: rub

admin/include/functions.php

@@ -762,7 +762,7 @@ function mass_updates($tablename, $dbfields, $datas)
         {
           $column.= " default '".$row['Default']."'";
         }
-        if (isset($row['Collation']))
+        if (isset($row['Collation']) and $row['Collation'] != 'NULL')
         {
           $column.= " collate '".$row['Collation']."'";
         }