openscad/openscad — pull request #222 by mrrobinson (2012-11-27 00:23:38+00:00)
Title: Difference test for subtracting something from nothing

The difference tests all subtract objects from an existing object but if
there is no existing object as the first argument the results are
inconsistent across Mac and Linux platforms. Added a test to highlight
this condition.

This is in response to https://github.com/openscad/openscad/issues/221