ezsystems/ezsurvey — pull request #16 by myxt (2013-08-26 11:08:41+00:00)
Title: Implemented mandatory option for multiple choice entries.

For some reason the option to make multiple choice entries mandatory has been removed from ezsurvey, and questions of this type are always mandatory. I don't know the exact motivation for this choice in the past, but fact is that for many people this is unwanted behavior.