Fixed #9756: the for tag no longer leaves the context stack unbalanced when dealing with an empty iterable. Thanks, seanl.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10439 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/defaulttags.py

@@ -125,6 +125,7 @@ class ForNode(Node):
             values = list(values)
         len_values = len(values)
         if len_values < 1:
+            context.pop()
             return self.nodelist_empty.render(context)
         nodelist = NodeList()
         if self.is_reversed: