message: throwing in hasNdbStructNtcCategories breaks non-mmcif files
diff: @@ -74,7 +74,7 @@ export namespace ConfalPyramids {
  }
  function hasNdbStructNtcCategories(model: Model): boolean {
  - if (!MmcifFormat.is(model.sourceData)) throw new Error('Data format must be mmCIF');
  + if (!MmcifFormat.is(model.sourceData)) return false;
  const names = (model.sourceData).data.frame.categoryNames;
  return names.includes('ndb_struct_ntc_step') && names.includes('ndb_struct_ntc_step_summary');
  }
  