Kód místa nesmí začínat na "#"

Closes #263.

mo/web/org_place.py

@@ -71,6 +71,10 @@ class PlaceEditForm(FlaskForm):
     )
     submit = wtforms.SubmitField('Uložit')
 
+    def validate_code(form: FlaskForm, field: mo_fields.String) -> None:
+        if field.data is not None and field.data.startswith('#'):
+            raise wtforms.ValidationError('Kód nesmí začínat na znak "#".')
+
 
 class PlaceSchoolEditForm(PlaceEditForm):
     red_izo = mo_fields.String('RED_IZO')