message: fix extractCrossLinkRestraints
diff: @@ -89,7 +89,9 @@ function createCrossLinkRestraint(unitA: Unit, indexA: StructureElement.UnitInde
  function extractCrossLinkRestraints(structure: Structure): PairRestraints<CrossLinkRestraint> {
  const pairs: CrossLinkRestraint[] = []
  - if (!structure.models.some(m => IHMCrossLinkRestraint.fromModel(m))) return new PairRestraints(pairs)
  + if (!structure.models.some(m => IHMCrossLinkRestraint.fromModel(m))) {
  + return new PairRestraints(pairs)
  + }
  const n = structure.units.length
  for (let i = 0; i < n; ++i) {
  