fix panic in memory_test when release status is nil
fix panic in memory_test when release status is nil

rbwsam/helm,technosophos/k8s-helm,michelleN/deployment-manager,jascott1/helm,appscode/helm,qwangrepos/helm,adamreese/deployment-manager,technosophos/deployment-manager,jascott1/helm,adamreese/deployment-manager,sushilkm/helm,vaikas-google/deployment-manager,SlickNik/helm,adamreese/deployment-manager,rbwsam/helm,appscode/helm,michelleN/deployment-manager,technosophos/deployment-manager,helm/helm,helm/helm,qwangrepos/helm,technosophos/deployment-manager,bradj/helm,iamzhout/helm,SlickNik/helm,yan234280533/helm,technosophos/deployment-manager,fibonacci1729/helm,bradj/helm,eicnix/helm,technosophos/k8s-helm,fibonacci1729/helm,FengyunPan/helm,adamreese/helm,michelleN/deployment-manager,kdada/helm,adamreese/helm,bacongobbler/helm,michelleN/deployment-manager,flynnduism/helm,adamreese/deployment-manager,thomastaylor312/helm,bacongobbler/helm,yan234280533/helm,kdada/helm,flynnduism/helm,adamreese/deployment-manager,iamzhout/helm,thomastaylor312/helm,FengyunPan/helm,vaikas-google/deployment-manager,eicnix/helm,sushilkm/helm,technosophos/deployment-manager