mozilla/addon-sdk — pull request #1256 by vinodc (2013-09-28 03:38:53+00:00)
Title: 920346 - Setting PYTHONPATH to original value even if original was blank.

At first glance, the bat scripts shouldn't have this issue, but I have not verified that.

https://bugzilla.mozilla.org/show_bug.cgi?id=920346