Show "File not found" on the loading screen when navigating to a non-existent resource.

src/main/resources/loading/index.html

@@ -97,8 +97,14 @@
       else if (status.id == "DOWNLOADED") {
         textStatus = status.description;
       }
+      else if (status.id == "NOT_PUBLISHED") {
+        document.getElementById("title").innerHTML = "File not found";
+        document.getElementById("description").innerHTML = "";
+        document.getElementById("c").style.opacity = "0.5";
+        textStatus = status.description;
+      }
 
-      if (status.localChunkCount != null && status.totalChunkCount != null) {
+      if (status.localChunkCount != null && status.totalChunkCount != null && status.totalChunkCount > 0) {
         textProgress = "Files downloaded: " + status.localChunkCount + " / " + status.totalChunkCount;
       }
 
@@ -276,8 +282,8 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 
 <div id="panel-outer">
   <div id="panel">
-    <h2>Loading</h2>
+    <h2 id="title">Loading</h2>
-    <p>
+    <p id="description">
       Files are being retrieved from the Qortal Data Network.
       This page will refresh automatically when the content becomes available.
     </p>