Warnings in watchdog from cron

The "extract" warning is gone in the latest CVS version, but

• warning: Variable passed to each() is not an array or object in subscriptions.module on line 535.

is still there.

BTW, the variable in question, $map, is empty, because $stype is NULL, which can certainly happen, because NULL is the default parameter value for $stype. The code

  $map = $stype_map[$stype];
  list($var, $object_type) = each($map);

should be prepared to handle this case, but I don't fully understand what it's doing, so I won't try to come up with a patch...