Bug 978709 - 2.d/6: don't throw in _deliverDataCallCallback loop. r=hsinyi

dom/system/gonk/RadioInterfaceLayer.js

@@ -1109,11 +1109,11 @@ DataConnectionHandler.prototype = {
       if (this._dataCallbacks.indexOf(callback) == -1) {
         continue;
       }
+      try {
         let handler = callback[name];
         if (typeof handler !== "function") {
           throw new Error("No handler for " + name);
         }
-      try {
         handler.apply(callback, args);
       } catch (e) {
         if (DEBUG) {