don't push empty responses

lib/reader.js

@@ -50,7 +50,9 @@ function checknext(reader) {
       if (seq === state.nextSeq)
         state.nextSeq++;
 
-      state.active = reader.push(object);
+      if (object)
+        state.active = reader.push(object);
+
       checknext(reader);
     });
   } else if (index.ended) {