Fix incorrect result for a server response of 204

The Rest Client will not always call the method getEntity() on a
com.sun.jersey.api.client.ClientResponse object, which is documented
to throw a UniformInterfaceException if the HTTP server response status
is 204 (No Content).
This fix prevents the Rest Client handling the thrown exception by
returning a 500 response to the caller, which would wrongly indicate
an Internal Server Error.

Change-Id: I7b78d2b43213e330593bbea559025f790db6264f
Issue-ID: AAI-48
Signed-off-by: mark.j.leonard <mark.j.leonard@gmail.com>