Another pipeline tweak

Change-Id: I8e48d228694550f1a676dc64cca46c63d4ef5c75
diff --git a/jjb/pipeline/voltha-physical-functional-tests.groovy b/jjb/pipeline/voltha-physical-functional-tests.groovy
index 32dce4c..633fccb 100644
--- a/jjb/pipeline/voltha-physical-functional-tests.groovy
+++ b/jjb/pipeline/voltha-physical-functional-tests.groovy
@@ -138,7 +138,7 @@
       cp $WORKSPACE/kind-voltha/scripts/logger/combined/*.0001 $WORKSPACE
       tar czf container-logs.tgz *.0001
 
-      gzip *-combined.log
+      gzip *-combined.log || true
       '''
       script {
         deployment_config.olts.each { olt ->