less/less.js — pull request #2120 by SomMeri (2014-07-25 20:41:03+00:00)
Title: Misleading error message 2069

Fixes #2069 - raise an error in case of an empty extend selector.

Note: I'm not sure why values order in source map changed. It does not seem to be caused by my change, it was failing before I made them.