message: mol-model: fixed Loci stats
diff: @@ -245,7 +245,7 @@ export namespace Stats {
  chainCounts.forEach((count, cI) => {
  if (offsets[cI + 1] - offsets[cI] === count) {
  // full chain
  - stats.chainCount += 1
  + stats.chainCount += 1;
  if (stats.chainCount === 1) {
  firstCI = cI;
  }
  @@ -268,7 +268,7 @@ export namespace Stats {
  const eI = elements[OrderedSet.getAt(indices, i)];
  const cI = index[eI];
  if (cI === firstCI) {
  - Location.set(stats.firstChainLoc, unit, elements[offsets[cI]]);
  + Location.set(stats.firstChainLoc, unit, eI);
  return;
  }
  }
  