made a more specific error message for lack of title

app/static/js/buildTest.js

@@ -176,7 +176,10 @@ document.addEventListener("DOMContentLoaded", function () {
         console.log("  > ID:", q.question_id, "Type:", q.type, "typeof ID:", typeof q.question_id);
       });
       console.log("🧾 Final questions payload:", testData.questions);
-
+      if (!testData.name || !testData.cohort) {
+        alert("Please enter a test name and cohort.");
+        return;
+      }
       fetch("/save-test", {
         method: "POST",
         headers: { "Content-Type": "application/json" },