Make sure listReleaseStacks returns no sets

LbRelease/python/LbRelease/SoftConfDB/SoftConfDB.py

@@ -196,7 +196,9 @@ class SoftConfDB(object):
             if not ismerged:
                 filteredstacks.append(s)
 
-        return filteredstacks
+        # Filter output to remove sets not liked by XMLRPC
+        nosetlist = [ list(e) for e in filteredstacks ]
+        return nosetlist
 
     def listVersions(self, project):
         ''' List the number of versions known for a given project '''