If, after parsing the media list, we've ended up with no media whatsoever, then the list must have been blank, which implies CSS_MEDIA_ALL.
If, after parsing the media list, we've ended up with no media whatsoever, then the list must have been blank, which implies CSS_MEDIA_ALL.

svn path=/trunk/libcss/; revision=8822

servo/libcss,servo/libcss,prepare/netsurf_libcss,servo/libcss,prepare/netsurf_libcss,zhuyadong/libcss,zhuyadong/libcss,prepare/netsurf_libcss,zhuyadong/libcss