Clean up error message extraction.
Clean up error message extraction.

xzyfer/sass-spec,sass/sass-spec,am11/sass-spec,xzyfer/sass-spec,xzyfer/sass-spec,nschonni/sass-spec,mgreter/sass-spec,sass/sass-spec,xzyfer/sass-spec,nschonni/sass-spec,nschonni/sass-spec,sass/sass-spec,sass/sass-spec,nschonni/sass-spec,am11/sass-spec,am11/sass-spec,mgreter/sass-spec,mgreter/sass-spec