Lazy Loading fuse-worker and fixed some potential timing issues when it's slow. Also keep last result while typing.

frontend/src/Components/Page/Header/fuse.worker.js

@@ -49,7 +49,7 @@ function getSuggestions(series, value) {
   return suggestions;
 }
 
-self.addEventListener('message', (e) => {
+onmessage = function(e) {
   if (!e) {
     return;
   }
@@ -59,5 +59,12 @@ self.addEventListener('message', (e) => {
     value
   } = e.data;
 
-  self.postMessage(getSuggestions(series, value));
-});
+  const suggestions = getSuggestions(series, value);
+
+  const results = {
+    value,
+    suggestions
+  };
+
+  self.postMessage(results);
+};