SMS Blast fails if one user encounters an error

Sending an SMS blast through our Twilio gateway, Twilio threw an exception which ended up being uncaught. Which is because a user unsubscribed through a text to Twilio but is still listed in the database as an active user. Why that happened is a separate issue.

But here, the issue is that even if that does happen, or even if there is some other unexpected error, SMS Blast shouldn't stop processing; in this case, the message was sent to 20 of 40 users on the list and then stopped.

The sms_blast_form_submit should instead catch the exceptions and continue processing. In my case I decided to just display the message:

 foreach ($users as $user) {
    try {
        sms_user_send($user['uid'], $form_state['values']['message']);
    } catch (Exception $e) {
        drupal_set_message('Not sent to ' . $user['name']);
    }
  }

Unless there are other ideas, I'll prepare a patch along those lines. [Will have to adjust the count message displayed at the end of processing as well.]