Update to handle when no compute endpoint is passed

Author: Sneha-at

cmd/gce-pd-csi-driver/main.go

@@ -244,6 +244,10 @@ func urlFlag(target **url.URL, name string, usage string) {
 			*target = computeURL
 			return nil
 		}
+		if flagValue == "" {
+			klog.Infof("No value recieved for %s", name)
+			return nil
+		}
 		klog.Infof("Error parsing endpoint compute endpoint %v", err)
 		return err
 	})

test/e2e/tests/single_zone_e2e_test.go

@@ -1295,6 +1295,14 @@ var _ = Describe("GCE PD CSI Driver", func() {
 
 		klog.Infof("Creating new driver and client for node %s\n", i.GetName())
 
+		tcEmpty, err := testutils.GCEClientAndDriverSetup(i, "")
+		if err != nil {
+			klog.Fatalf("Failed to set up Test Context for instance %v: %v", i.GetName(), err)
+		}
+		_, err = tcEmpty.Client.ListVolumes()
+
+		Expect(err).To(BeNil(), "no error expected when passed empty compute url")
+
 		// Create new driver and client w/ valid, passed-in endpoint
 		tcValid, err := testutils.GCEClientAndDriverSetup(i, "https://compute.googleapis.com")
 		if err != nil {