message: Add check to map clearing.
diff: @@ -223,6 +223,7 @@ void EsdfServer::esdfMapCallback(const voxblox_msgs::Layer& layer_msg) {
  void EsdfServer::clear() {
  esdf_map_->getEsdfLayerPtr()->removeAllBlocks();
  esdf_integrator_->clear();
  + CHECK_EQ(esdf_map_->getEsdfLayerPtr()->getNumberOfAllocatedBlocks(), 0);
  TsdfServer::clear();
  }
  