edx/edx-platform — pull request #481 by chrisndodge (2013-07-23 19:31:16+00:00)
Title: It seems like self.tabs is getting set to an empty set [] now rather tha...

...n None. This causes the tab defaulting to not populate, leading to crashes in the LMS if someone makes a new course with additional tabs (e.g. static tabs or pdf-textbooks)