stephenmcd/mezzanine — pull request #320 by hakanb (2012-07-15 01:18:42+00:00)
Title: Use file.url instead of file.path to auto-generate descriptions for gallery image, as remote storage backends such as S3BotoStorage do not support the file.path method.

See here for discussion:
https://groups.google.com/forum/?fromgroups#!topic/mezzanine-users/_MX19FhwOO8