We should check if keyfrm is NULL in one of the loop in global optimize?

[Dung-ND]

Hi
In this loop:

openvslam/src/openvslam/optimize/global_bundle_adjuster.cc

Lines 141 to 154 in 9eb280a

	for (auto keyfrm : keyfrms) {
	if (keyfrm->will_be_erased()) {
	continue;
	}
	auto keyfrm_vtx = keyfrm_vtx_container.get_vertex(keyfrm);
	const auto cam_pose_cw = util::converter::to_eigen_mat(keyfrm_vtx->estimate());
	if (lead_keyfrm_id_in_global_BA == 0) {
	keyfrm->set_cam_pose(cam_pose_cw);
	}
	else {
	keyfrm->cam_pose_cw_after_loop_BA_ = cam_pose_cw;
	keyfrm->loop_BA_identifier_ = lead_keyfrm_id_in_global_BA;
	}
	}

should we have if (!keyfrm) condition?