ansible/ansible — pull request #4698 by succhiello (2013-10-28 12:43:49+00:00)
Title: add NoneType check.

Version 1.2.3 or earlier, ec2_elb module allows deregistering instance without 'ec2_elbs' parameter.But 1.3.0 or later, it raises 'TypeError: 'NoneType' object is not iterable'.