Simplified widgets.Select._choice_has_empty_value().

django/forms/widgets.py

@@ -681,7 +681,7 @@ class Select(ChoiceWidget):
     def _choice_has_empty_value(choice):
         """Return True if the choice's value is empty string or None."""
         value, _ = choice
-        return (isinstance(value, str) and not value) or value is None
+        return value is None or value == ''
 
     def use_required_attribute(self, initial):
         """