Create dummy bomber database, no alert on background sync fail

nullboard.html

@@ -1303,13 +1303,23 @@
 
       sync()
       {
-         console.log("syncing to replicas: " + this.pendingSyncCount());
+         var n = this.pendingSyncCount();
+         try
+         {
             this.deltas.popEach((key) => {
                console.log("syncing to replicas: " + key);
                this.replicate(key);
             });
+         }
+         catch (e)
+         {
+            console.log("failed to sync: " + e);
+         }
+         finally
+         {
             this.writePendingSyncCount();
          }
+      }
 
       pendingSyncCount()
       {
@@ -1319,7 +1329,7 @@
       writePendingSyncCount()
       {
          var n = this.pendingSyncCount();
-         var s = "(" + n + ")";
+         var s = "(" + n + " items pending replication)";
          if (! n)
             s = ""
          document.getElementById("pending").innerHTML = s;
@@ -1429,6 +1439,27 @@
       }
    }
 
+   class Bomber extends Database {
+      get(key) {
+         throw "teehee";
+      }
+
+      set(key, value)
+      {
+         throw "teehee";
+      }
+
+      del(key)
+      {
+         throw "teehee";
+      }
+
+      forEach(foo)
+      {
+         throw "teehee";
+      }
+   }
+
    class Local extends Database {
       constructor()
       {
@@ -1467,10 +1498,10 @@
       }
    }
 
-   globalStorage = new NamespacedDatabase("4", new Local());
    globalStorage = new MultiDatabase(
       new NamespacedDatabase("A", new Local()),
       new NamespacedDatabase("B", new Local()),
+      //new Bomber(),
    );
 
 	/*