ACE-249 - properly handle exceptions during streaming:

- when a AceRestException cannot propagate a given exception to the calling
  side, make sure to log it on the server as a last resort to get some clue
  as to why things are failing.



git-svn-id: https://svn.apache.org/repos/asf/ace/trunk@1574940 13f79535-47bb-0310-9956-ffa450edef68