limitation with ec_recurring and ec_donate

While working on getting recurring donations going with ec_donate, I have found that ec_recurring will only work with a transaction that has items that have a schedule attached to them.

For ec_donate, the transactions have no items, hence ec_recurring won't work. What I suggest is adding another stanza to handle this. It would be located in addition to the code in the ec_recurring_alloc_get_recurring() function in ec_recurring.alloc.inc

if(count($txn->items)==0 && $txn->type=='donation') { // this is a donation transaction
      module_load_include('inc', 'ec_recurring');
      $schedule = ec_recurring_schedule_load($form_state['values']['schedule_id']);
      $recurring = array(
        'name' => $schedule['name'],   
        'start_date' => _ec_recurring_expiry_calc($schedule),
        'price' => $txn->gross,
        'period' => $schedule['numunits'],
        'unit' => $schedule['unit'],
        'repeat' => $schedule['cycles'],
        'description' => 'Donation of ' .$txn->gross. ' recurring every ' .$schedule['numunits']. ' ' .$schedule['unit'],
      );
      return $recurring;