VOL-2827 Bug fix for periodic pipelines

Change-Id: I667205595cdff8f481a74dfcfc49432776f860e0
diff --git a/jjb/pipeline/voltha-go-multi-tests.groovy b/jjb/pipeline/voltha-go-multi-tests.groovy
index 67bc458..3f16f30 100644
--- a/jjb/pipeline/voltha-go-multi-tests.groovy
+++ b/jjb/pipeline/voltha-go-multi-tests.groovy
@@ -75,6 +75,7 @@
     stage('Deploy Voltha') {
       steps {
         sh """
+           export EXTRA_HELM_FLAGS=""
            if [ "${manifestBranch}" != "master" ]; then
              echo "on branch: ${manifestBranch}, sourcing kind-voltha/releases/${manifestBranch}"
              source "$HOME/kind-voltha/releases/${manifestBranch}"