message: fix: don't output empty aminoacid ranges
diff: @@ -76,6 +76,7 @@ namespace Nextclade {
  for (const auto& peptide : peptides) {
  auto ranges = findAminoacidRanges(peptide.seq, aa);
  const auto length = calculateTotalLength(ranges);
  + if (length > 0) {
  geneAminoacidRanges.push_back(GeneAminoacidRange{
  .geneName = peptide.name,
  .character = aa,
  @@ -83,6 +84,7 @@ namespace Nextclade {
  .length = length,
  });
  }
  + }
  return geneAminoacidRanges;
  }
  