sass/libsass — pull request #769 by xzyfer (2014-12-26 07:17:26+00:00)
Title: Don't output empty blocks

This PR replicates the Ruby sass behaviour of removing declarations with SassScript values that evaluated to `null`. This by proxy means blocks made up of only these values aren't outputted.

Fixes https://github.com/sass/libsass/issues/659. Specs added https://github.com/sass/sass-spec/pull/199.