fix main_point form into hidden field

src/c3nav/editor/forms.py

@@ -49,6 +49,11 @@ class EditorFormBase(I18nModelFormMixin, ModelForm):
             if not geometry_editable:
                 # can't see this geometry in editor
                 self.fields.pop('main_point')
+            else:
+                # hide geometry widget
+                self.fields['main_point'].widget = HiddenInput()
+                if not creating:
+                    self.initial['main_point'] = mapping(self.instance.main_point) if self.instance.main_point else ""
 
         if self._meta.model.__name__ == 'Source' and self.request.user.is_superuser:
             Source = self.request.changeset.wrap_model('Source')

src/c3nav/mapdata/models/geometry/space.py

@@ -125,7 +125,7 @@ class Area(SpaceGeometryMixin, SpecificLocation, models.Model):
     slow_down_factor = models.DecimalField(_('slow down factor'), max_digits=6, decimal_places=2, default=1,
                                            validators=[MinValueValidator(Decimal('0.01'))],
                                            help_text=_('values of overlapping areas get multiplied!'))
-    main_point = GeometryField('point', null=True,
+    main_point = GeometryField('point', null=True, blank=True,
                                help_text=_('main routing point (optional)'))
 
     class Meta: