Fix Nil is not determined which is equal to null string/array etc.
Fix Nil is not determined which is equal to null string/array etc.

scopely/msgpack-cli,msgpack/msgpack-cli,undeadlabs/msgpack-cli,undeadlabs/msgpack-cli,scopely/msgpack-cli,modulexcite/msgpack-cli,msgpack/msgpack-cli,modulexcite/msgpack-cli