being written hasn't been registered yet and does not
have an explicit ID set. The old way would try to send
it anyway and then it would fail to get received on the
other end.
A setStrictRegistration(false) method can be used to get the
old behavior if needed.
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7222 75d07b2b-3a1a-0410-a2c5-0572b91ccdca