Bugfix in copy event feature: load_from_instance() initialized empty

fields.

dav_events/forms/events.py

@@ -897,6 +897,8 @@ class SummaryForm(EventCreateForm):
                                     widget=forms.Textarea(attrs={'rows': 5}))
 
     def proceed_session_data(self, session_data):
+        super(SummaryForm, self).proceed_session_data(session_data)
+
         registration_required = self._session_data.get('registration_required', False)
         if registration_required:
             deadline = self._session_data.get('deadline', None)

dav_events/forms/generic.py

@@ -164,7 +164,9 @@ class ModelMixin(object):
             raise TypeError('Expected %s' % model.__class__.__name__)
         data = {}
         for field in instance._meta.get_fields():
-            data[field.name] = getattr(instance, field.name)
+            v = getattr(instance, field.name)
+            if v is not None:
+                data[field.name] = getattr(instance, field.name)
         self.is_bound = True
         self.data = data
         return data