Description of problem: I am not able to schedule operation wich does not require any input parameters via REST


Version-Release number of selected component (if applicable):
RHQ 4.8-master

How reproducible:always


Steps to Reproduce:
1. create a draft operation by POST /operation/definition/<OPDEF>?resourceId=<RES> where OPDEF is an operation definition for resource RES wich does not require any input params

as a response body you get something like this:

{u'name': u'viewProcessList', u'links': [{u'edit': {u'href': u'http://localhost:7080/rest/operation/1365575059'}}],
u'resourceId': 10001, u'definitionId': 10006, u'readyToSubmit': False, u'params': {}, u'id': 1365575059}

2. change 'readyToSubmit' to True
2. remove 'links' key from the body and POST it to operation/1365575059

Actual results: 

Scheduling fails with message

{u'message': u'Parameter Validation of parameters failed is bad: Definition is null'}

Expected results: Scheduling is successfull


Additional info: