message: fix param out of scope check in doparamsave
diff: @@ -1408,8 +1408,10 @@ void WiFiManager::doParamSave(){
  if(_paramsCount > 0){
  DEBUG_WM(DEBUG_VERBOSE,F("Parameters"));
  DEBUG_WM(DEBUG_VERBOSE,FPSTR(D_HR));
  +
  for (int i = 0; i < _paramsCount; i++) {
  - if (_params[i] == NULL) {
  + if (_params[i] == NULL || _params[i]->_length == 0) {
  + DEBUG_WM(DEBUG_ERROR,"[ERROR] WiFiManagerParameter is out of scope");
  break; // @todo might not be needed anymore
  }
  //read parameter from server
  