fix assertion failed error

src/Features2d.cc

@@ -84,7 +84,14 @@ class AsyncDetectSimilarity: public Nan::AsyncWorker {
 
     }
     else {
-      dissimilarity = std::numeric_limits<double>::quiet_NaN();
+      Nan::HandleScope scope;
+
+      Local<Value> argv[2];
+
+      argv[0] = Nan::Null();
+      argv[1] = Nan::Null();
+
+      callback->Call(2, argv);
     }
 
   }