MongoEngine/mongoengine — pull request #469 by jyapayne (2013-09-18 17:42:42+00:00)
Title: Fixes AttributeError when using storage.exists() on a non-existing file.

This bit of code has caused a lot of trouble for me. It causes an attribute error when calling GridFSStorage.exists() on an file name that does not currently exist when it should return False.