edx/edx-platform — pull request #6145 by wedaly (2014-12-04 13:47:36+00:00)
Title: Fix issue with iframe redirect

Fix for [ECOM-735](https://openedx.atlassian.net/browse/ECOM-735): Markting iframe redirects to "undefined&email_opt_in=false"

Reviewers: @dianakhuang @stephensanchez
FYI: @rlucioni