fix issue#9912 : helm list panic when release.Chart is nil

cmd/helm/list.go

@@ -157,8 +157,11 @@ func newReleaseListWriter(releases []*release.Release, timeFormat string) *relea
 			Namespace: r.Namespace,
 			Revision:  strconv.Itoa(r.Version),
 			Status:    r.Info.Status.String(),
-			Chart:      fmt.Sprintf("%s-%s", r.Chart.Metadata.Name, r.Chart.Metadata.Version),
+		}
-			AppVersion: r.Chart.Metadata.AppVersion,
+
+		if r.Chart != nil {
+			element.Chart = fmt.Sprintf("%s-%s", r.Chart.Metadata.Name, r.Chart.Metadata.Version)
+			element.AppVersion = r.Chart.Metadata.AppVersion
 		}
 
 		t := "-"