raphael-group/hotnet2 — pull request #4 by mdml (2014-09-13 20:27:15+00:00)
Title: set `addtl_genes` to be a `set()` by default

I kept getting a `TypeError: None type is not iterable` error when trying to run significance, and I believe this is the culprit. Certainly when I changed it to a `set()` everything worked smoothly.