[SMX4-1585]org.apache.servicemix.cxf.transport.nmr.NMRConduitOutputStream.commitOutputMessage() does not propagate exception.

git-svn-id: https://svn.apache.org/repos/asf/servicemix/smx4/features/branches/features-4.5.x@1531273 13f79535-47bb-0310-9956-ffa450edef68