Steps to Reproduce:

1. example
   maven_info = {}
   Run createMavenBuild(name_build, maven_info)

2. example
   maven_info = {'group_id': u'org.ovirt.vdsm-jsonrpc-java', 'version': u'1.4.7'}
   Run createMavenBuild(name_build, maven_info)

3. example
   maven_info = {'group_id': u'org.ovirt.vdsm-jsonrpc-java', 'artifact_id': u'vdsm-jsonrpc-java-client'}
   Run createMavenBuild(name_build, maven_info)

Actual result:

1. example:
   Fault: <Fault 1: "<type 'exceptions.KeyError'>: 'group_id'">

2. example:
   Fault: <Fault 1: "<type 'exceptions.KeyError'>: 'artifact_id'">

3. example:
   Fault: <Fault 1: "<type 'exceptions.KeyError'>: 'version'">

Expected result:

Should be returning an error message that maven info does not have all obligatory keys.