Fixed behaviour when log persistent volume had never been created.

continuousintegration/buildtree_runner/recreate_buildtree_running_environment.sh

@@ -61,6 +61,6 @@ echo Generating kubernetes persistent volumes
 ### puppet:///modules/hg_cta/generate_PV.sh
 echo Generating the log persistent volume
 mkdir -pv /shared/logs
-sudo kubectl delete pv log
+sudo kubectl delete pv log || true
 sudo kubectl create -f ./log_PV.yaml
 sudo kubectl get persistentvolumes -l type=logs