[damned-lies] Fixed empty value of author form widget

[Claude Paroz <claudep src gnome org>]

commit 52a74999f58374ada2d3c75fcf845da7ac74f628
Author: Claude Paroz <claude 2xlibre net>
Date:   Fri Aug 22 08:14:02 2014 +0200

    Fixed empty value of author form widget

 vertimus/forms.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vertimus/forms.py b/vertimus/forms.py
index 8ccb155..5b627c1 100644
--- a/vertimus/forms.py
+++ b/vertimus/forms.py
@@ -42,7 +42,7 @@ class ActionWidget(forms.Select):
 class AuthorWidget(forms.Select):
     """ Custom widget to disable people without full name """
     def render_options(self, choices, selected_choices):
-        output = ["<option value=\"None\">--------</option>"]
+        output = ["<option value=\"\">--------</option>"]
         field = self.choices.field
         for obj in field.queryset.all():
             val, label = field.prepare_value(obj), field.label_from_instance(obj)