Removed extraneous check of keys

            // Calculate the orientations of passive elements

            passive_orientations_[geometry_section.getName()] = calculate_orientation(geometry_section);

            // Check for mandatory but hitherto unused keys:

            auto check_key = [&](const Configuration& cfg, const std::string& key) {

                if(!cfg.has(key)) {

                    throw MissingKeyError(key, cfg.getName());

                }

            };

            // Check type keyword

            check_key(geometry_section, "type");

            // Check material unless it's a GDML file placement

            auto type = geometry_section.get<std::string>("type");

            std::transform(type.begin(), type.end(), type.begin(), ::tolower);

            if(type != "gdml") {

                check_key(geometry_section, "material");

            }

            passive_elements_.push_back(geometry_section);

            LOG(DEBUG) << "Passive element " << geometry_section.getName() << ", putting aside";