mateu-aguilo-bosch/zendesk_api — pull request #8 by makangus (2014-09-17 15:17:08+00:00)
Title: Support #empty_option

We have been using the following to add the empty option to the zendesk options field.
```
'#zendesk_extra_parameters' => array(
'#additional_options' => array(
'' => t('Select your subject'),
),
),
```
We should support the attribute #empty_option like Drupal does.
```
'#empty_option' => t('Select your subject'),
```