NS scenarios without VNFs compatibility

Signed-off-by: gcalvino <guillermo.calvinosanchez@altran.com>
diff --git a/osm_lcm/ROclient.py b/osm_lcm/ROclient.py
index ec31b39..73a1b13 100644
--- a/osm_lcm/ROclient.py
+++ b/osm_lcm/ROclient.py
@@ -104,7 +104,7 @@
     mandatory_for_create = {
         'tenant': ("name", ),
         'vnfd': ("name", "id", "connection-point", "vdu"),
-        'nsd': ("name", "id", "constituent-vnfd"),
+        'nsd': ("name", "id"),
         'ns': ("name", "scenario", "datacenter"),
         'vim': ("name", "vim_url"),
         'vim_account': (),