Steps to reproduce: 

1) Add network to cluster, with a network-id that doesn't exist in rhevm database, for example: 

  <network id="2b8efd92-1779-40db-87a4-043f27dd3bc0">
    <name>green</name>
  </network>

2) Failure at database level (naturally).

3) VdcReturnValueBase object, which is returned, has emtpy executeFailedMessages[] array (the error can be seen only in 'fault' field which is internal).


Expected Results: 

VdcReturnValueBase-->executeFailedMessages[] should contain a description of the failure.