boto/boto — pull request #2726 by twirrim (2014-10-31 23:16:41+00:00)
Title: Improve handling of HTTP 204 responses.

HTTP 204 responses have no body, but can have any headers they like,
including, counter-intuitively, ones specifying the content type.

This makes sure Boto won't pass a 0 length body to the json parser in
response to a 204 status from Glacier.

Unit test added to catch any regression.