Update draw-web-worker/main.js

draw-web-worker/main.js

@@ -44,10 +44,12 @@ if (window.Worker) {
     function drawShape(event) {
         // initial selection will contain value="", then this to default
         // lightgrey square.
+        validColor = (color.value!=="" ? color.value : "lightgrey");
+        validShape = (shape.value!==""? shape.value : "square");
         const drawData = {
             command: "draw",
-            selectedColor: color.value.toLowerCase() ? "" : "lightgrey",
-            selectedShape: shape.value.toLowerCase() ? "" : "square",
+            selectedColor: validColor,
+            selectedShape: validShape
         }
         worker.postMessage(drawData);
         worker.addEventListener("message", messageFromWorker);