app create with param file fails

Change-Id: I821ac51f0d0f0c994d131202de522968ca5c82c7
Closes-Bug: #1519805

solumclient/solum.py

@@ -729,6 +729,7 @@ Available commands:
             app_data['ports'] = port_list
 
     def _get_parameters(self, app_data, args):
+        app_data['parameters'] = {}
         if args.param_file is not None:
             try:
                 with open(args.param_file) as param_f:
@@ -865,6 +866,9 @@ Available commands:
                 },
                 "ports": {
                     "type": "array"
+                },
+                "parameters": {
+                    "type": "array"
                 }
             },
             "required": ["version", "name", "description",