Using harbor registry in bbsim-sanity-job

Change-Id: I524548f924be21a5d1907e63b81f62993dd3875e
diff --git a/jjb/pipeline/voltha/master/bbsim-tests.groovy b/jjb/pipeline/voltha/master/bbsim-tests.groovy
index 3cc9064..63d2582 100644
--- a/jjb/pipeline/voltha/master/bbsim-tests.groovy
+++ b/jjb/pipeline/voltha/master/bbsim-tests.groovy
@@ -55,7 +55,7 @@
       return "--set images.bbsim.tag=citest,images.bbsim.pullPolicy=Never,images.bbsim.registry='' "
     break
     default:
-    break
+      return ""
   }
 
   return "--set ${chart}.images.${image}.tag=citest,${chart}.images.${image}.pullPolicy=Never,${chart}.images.${image}.registry='' "