Improve actors serialization handling

[austinabell]

Summary of changes
Changes introduced in this pull request:

• Handles serialization errors from message serialized bytes now that feat(vm): implement improved error handling #289 is in
• Change serialized default to serializing empty array, as it is too easy to misuse the default that exists now (will just be empty bytes which will fail the empty serialize check)
  • Also removes the empty_return function as this is just the serialized default

Reference issue to close (if applicable)

Closes

Other information and links