Fixed #15628 -- Made the admin error email more useful when there isn't a request associated with the message. Thanks to hynek for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15869 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/log.py

@@ -79,7 +79,11 @@ class AdminEmailHandler(logging.Handler):
             )
             request_repr = repr(request)
         except:
-            subject = 'Error: Unknown URL'
+            subject = '%s: %s' % (
+                record.levelname,
+                record.msg
+            )
+
             request = None
             request_repr = "Request repr() unavailable"