Fixed #6928 -- Added a little more robustness to transaction rollback…

…s for Python 2.5. Patch from guettli.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7802 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/transaction.py

@@ -196,7 +196,10 @@ def _commit_on_success(*args, **kw):
             managed(True)
             try:
                 res = func(*args, **kw)
-            except Exception, e:
+            except (Exception, KeyboardInterrupt, SystemExit):
+                # (We handle KeyboardInterrupt and SystemExit specially, since
+                # they don't inherit from Exception in Python 2.5, but we
+                # should treat them uniformly here.)
                 if is_dirty():
                     rollback()
                 raise