message: Accept default argument of FLANN index parameters
diff: @@ -23,6 +23,9 @@ bool pyopencv_to(PyObject *o, cv::flann::IndexParams& p, const char *name)
  PyObject* item = NULL;
  Py_ssize_t pos = 0;
  + if (!o || o == Py_None)
  + return true;
  +
  if(PyDict_Check(o)) {
  while(PyDict_Next(o, &pos, &key, &item)) {
  if( !PyString_Check(key) ) {
  