Fixup parsing of empty inline styles -- previously, it would emit the START_STYLESHEET and START_RULESET events twice.
Fixup parsing of empty inline styles -- previously, it would emit the START_STYLESHEET and START_RULESET events twice.

svn path=/trunk/libcss/; revision=8242

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