check ranked values are all integers

extra/vote/ranked_items.py

@@ -70,6 +70,8 @@ class RankedItemsWidget(CompositeWidget):
         for name in self.element_names:
             value = self.get(name)
             values[self.element_names[name]] = value
+            if type(value) is not int:
+                self.get_widget(name).set_error(IntWidget.TYPE_ERROR)
         self.value = values or None
 
     def parse(self, request=None):