test: python stability fixes

Author: porcellus

test/helpers.js

@@ -552,11 +552,11 @@ async function assertValidator(actualValidate, expectedValidate, values) {
 export async function getLatestURLWithToken() {
     let latestURLWithToken;
     const start = Date.now();
-    while (latestURLWithToken === undefined) {
+    while (!latestURLWithToken) {
         const response = await fetch(`${TEST_APPLICATION_SERVER_BASE_URL}/token`);
         const respBody = await response.json();
         latestURLWithToken = respBody.latestURLWithToken;
-        if (latestURLWithToken === undefined || latestURLWithToken === "") {
+        if (!latestURLWithToken) {
             if (Date.now() - start > 10000) {
                 throw new Error("Timeout waiting for latestURLWithToken");
             }