experiment: try to avoid race condition

FileOVMB.cc

@@ -158,10 +158,14 @@ int FileOVMBPlugin::loadObject(QString _filename)
 
     BaseObjectData* obj = nullptr;
     if (*topo_type == TopoType::Tetrahedral) {
+        TetrahedralMesh m;
+        result = reader->read_file(m);
         emit addEmptyObject(DATA_TETRAHEDRAL_MESH, id);
         auto *mo = PluginFunctions::tetrahedralMeshObject(id);
-        result = reader->read_file(*mo->mesh());
         obj = mo;
+        if (result == ReadResult::Ok) {
+            *mo->mesh() = std::move(m);
+        }
     } else if (*topo_type == TopoType::Hexahedral) {
         emit addEmptyObject(DATA_HEXAHEDRAL_MESH, id);
         auto *mo = PluginFunctions::hexahedralMeshObject(id);
@@ -177,6 +181,8 @@ int FileOVMBPlugin::loadObject(QString _filename)
         return -1;
     }
     if (result != ReadResult::Ok) {
+        emit log(LOGERR, QString("Failed to load OVMB file:") + to_string(result));
+        return -1;
     }
     obj->setFromFileName(_filename);
     obj->setName(obj->filename());