message: allow summaries without all modes
diff: @@ -57,6 +57,9 @@ def summarize(bench_files):
  'speedup': speedup,
  })
  + ## Filter out modes which don't have data, and thus no speedups
  + speedups = {k: v for k, v in speedups.items() if v != []}
  +
  for mode, speedup_list in speedups.items():
  print('{}: {:.2f}x'.format(
  mode,
  