Added exception for null kubectl commands

lib/utilities/kubectl-util.js

@@ -74,7 +74,7 @@ exports.downloadKubectl = downloadKubectl;
 function getTrafficSplitAPIVersion(kubectl) {
     const result = kubectl.executeCommand('api-versions');
     const trafficSplitAPIVersion = result.stdout.split('\n').find(version => version.startsWith(trafficSplitAPIVersionPrefix));
-    if (trafficSplitAPIVersion == null || typeof trafficSplitAPIVersion == 'undefined') {
+    if (!trafficSplitAPIVersion) {
         throw new Error('UnableToCreateTrafficSplitManifestFile');
     }
     return trafficSplitAPIVersion;