message: don't remove C! assembly symmetry
diff: @@ -63,21 +63,22 @@ export namespace AssemblySymmetry {
  console.error('expected `rcsb_struct_symmetry` field')
  return []
  }
  - const symmetry = result.assembly.rcsb_struct_symmetry as AssemblySymmetryValue
  - return symmetry.filter(s => s.symbol !== 'C1')
  + return result.assembly.rcsb_struct_symmetry as AssemblySymmetryValue
  }
  }
  export function getSymmetrySelectParam(structure?: Structure) {
  - const param = PD.Select<number>(0, [[0, 'No Symmetries']])
  + const param = PD.Select<number>(-1, [[-1, 'No Symmetries']])
  if (structure) {
  const assemblySymmetry = AssemblySymmetryProvider.get(structure).value
  if (assemblySymmetry) {
  const options: [number, string][] = []
  for (let i = 0, il = assemblySymmetry.length; i < il; ++i) {
  const { symbol, kind } = assemblySymmetry[i]
  + if (symbol !== 'C1') {
  options.push([ i, `${i + 1}: ${symbol} ${kind}` ])
  }
  + }
  if (options.length) {
  param.options = options
  param.defaultValue = options[0][0]
  