rollback on dummy database now has no effect (previously raised an error). This…

rollback on dummy database now has no effect (previously raised an error). This means that custom 500 error pages (and e-mailed exceptions) now work even if a database has not been configured. Fixes #4429.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5410 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/dummy/base.py

@@ -12,6 +12,9 @@ from django.core.exceptions import ImproperlyConfigured
 def complain(*args, **kwargs):
     raise ImproperlyConfigured, "You haven't set the DATABASE_ENGINE setting yet."
 
+def ignore(*args, **kwargs):
+    pass
+
 class DatabaseError(Exception):
     pass
 
@@ -21,7 +24,7 @@ class IntegrityError(DatabaseError):
 class DatabaseWrapper:
     cursor = complain
     _commit = complain
-    _rollback = complain
+    _rollback = ignore
 
     def __init__(self, **kwargs):
         pass