Bug 1026347 - Session:Prefetch should watch for empty nsIURI.host r=bnicholson

mobile/android/chrome/content/browser.js

@@ -8092,12 +8092,12 @@ var Tabs = {
       case "Session:Prefetch":
         if (aData) {
           let uri = Services.io.newURI(aData, null, null);
-          if (uri && !this._domains.has(uri.host)) {
-            try {
+          try {
+            if (uri && !this._domains.has(uri.host)) {
               Services.io.QueryInterface(Ci.nsISpeculativeConnect).speculativeConnect(uri, null);
               this._domains.add(uri.host);
-            } catch (e) {}
-          }
+            }
+          } catch (e) {}
         }
         break;
     }