find groups should not exception if parent stem not found, it should just not find it, right?

//delete groups in stem
WsQueryFilter wsQueryFilter = new WsQueryFilter();
wsQueryFilter.setQueryFilterType("FIND_BY_STEM_NAME");
wsQueryFilter.setStemName(stemName);
WsFindGroupsResults wsFindGroupsResults = new GcFindGroups()
.assignQueryFilter(wsQueryFilter).execute();
for (WsGroup wsGroup : FastObjectUtils.nonNull(wsFindGroupsResults.getGroupResults(), WsGroup.class )) {
new GcGroupDelete().addGroupLookup(new WsGroupLookup(wsGroup.getName(), null)).execute();

1) testCreate(edu.upenn.isc.secureSpace.beans.CreateSpaceTest)edu.internet2.middleware.grouperClient.ws.GcWebServiceError: Bad response from web service: resultCode: EXCEPTION, clientVersion: 1.4.0, wsQueryFilter: WsQueryFilter[queryFilterType=FIND_BY_STEM_NAME,stemName=test:isc:ait:apps:secureSpace:spaces:space_TESTING_JUNIT]
, includeGroupDetail: false, actAsSubject: null, paramNames:
, params: null
, wsGroupLookups: null, edu.internet2.middleware.grouper.exception.QueryException: Stem not found: 'test:isc:ait:apps:secureSpace:spaces:space_TESTING_JUNIT'
at edu.internet2.middleware.grouper.filter.GroupsInStemFilter.getResults(GroupsInStemFilter.java:83)
at edu.internet2.middleware.grouper.filter.GrouperQuery.getGroups(GrouperQuery.java:115)
at edu.internet2.middleware.grouper.ws.GrouperServiceLogic.findGroups(GrouperServiceLogic.java:755)
at edu.internet2.middleware.grouper.ws.soap.GrouperService.findGroups(GrouperService.java:231)
at edu.internet2.middleware.grouper.ws.rest.GrouperServiceRest.findGroups(GrouperServiceRest.java:113)
at edu.internet2.middleware.grouper.ws.rest.method.GrouperWsRestGet$1.service(GrouperWsRestGet.java:73)
at edu.internet2.middleware.grouper.ws.rest.method.GrouperRestHttpMethod$1.service(GrouperRestHttpMethod.java:42)
at edu.internet2.middleware.grouper.ws.rest.GrouperRestServlet.service(GrouperRestServlet.java:180)