LBAAS config generation on controller

If si.kvps is none, exception will happen which
would trigger si without kvps

Change-Id: I0835964c4da2a7973d636c34aa0ffabdfa5bed5d
Partial-Bug: #1557222

src/config/svc-monitor/svc_monitor/services/loadbalancer/drivers/ha_proxy/driver.py

@@ -405,10 +405,10 @@ def set_haproxy_config(self, si_id, lb_uuid, conf):
         if not si:
             return
 
-        for kv in si.kvps:
+        for kv in si.kvps or []:
             if kv['key'] == 'haproxy_config':
-                 if kv['value'] == conf:
-                     return
+                if kv['value'] == conf:
+                    return
 
         si_obj = ServiceInstance()
         si_obj.uuid = si.uuid