pyrocms/pyrocms — pull request #2870 by ChristianGiupponi (2013-07-17 16:54:40+00:00)
Title: Update field.choice.php

Based on my tests on differents sites the form_dropdownd would not manage correctly the value after a form error.
The problem was a misinterpretation of the !$entry_id that always was valued as false.
The !is_null instead works perfectly.
Please test it and if good merge to the project!