Shortcut for the if inner visit for empty branches.

--HG--
branch : trunk

diff --git a/jinja2/compiler.py b/jinja2/compiler.py
index 2dd68cdda1e2d2f69f17c8f4d6ae3ed3b9573eae..a6f26a59219558333ef140a3b8f90c6d399474ac 100644 (file)
--- a/jinja2/compiler.py
+++ b/jinja2/compiler.py
@@ -278,6 +278,8 @@ class FrameIdentifierVisitor(NodeVisitor):
                     real_identifiers.declared_parameter
 
         def inner_visit(nodes):
+            if not nodes:
+                return set()
             self.identifiers = real_identifiers.copy()
             for subnode in nodes:
                 self.visit(subnode)