deserialise validation

[vlappa]

Related to #17

Liblo was detecting a error when a message argument was send as []byte{}, while scgolang/osc won't.

Looking at the liblo library, scgolang/osc might miss some validation functions when de-serializing a osc message

https://github.com/radarsat1/liblo/blob/02989c6c69f54157b8d9651fb8d9ad6de8128d59/lo/lo_errors.h#L35
https://github.com/radarsat1/liblo/blob/02989c6c69f54157b8d9651fb8d9ad6de8128d59/src/message.c#L964