thoughtbot/paperclip — pull request #992 by eoin (2012-08-15 22:39:20+00:00)
Title: Account for fog returning nil when a remote file is not present

Fog will not throw an exception when a remote file is not present,
instead it returns nil.

http://fog.io/1.5.0/rdoc/Fog/Storage/AWS/Files.html#method-i-get