Check if daughter rotation is nullptr in GDML processing code

                // Add offset and rotation to current daughter location

                G4ThreeVector position_vector = toG4Vector(position_);

                auto* rotation_matrix = new G4RotationMatrix(*gdml_daughter->GetRotation() * *rotation_);

                auto* daughter_rotation = gdml_daughter->GetRotation();

		//It seems that in the case of a trivial rotation the daughter_rotation can be a nullptr

                auto* rotation_matrix = (daughter_rotation ? new G4RotationMatrix(*daughter_rotation * *rotation_)

                                                           : new G4RotationMatrix(*rotation_));

                LOG(TRACE) << "Rotation matrix: " << *rotation_matrix;

                gdml_daughter->SetTranslation(gdml_daughter->GetTranslation() + position_vector);

                gdml_daughter->SetRotation(rotation_matrix);