The first commit is failing on Arm and I think the fix should stop more
trailing comma issues which keep happening.

The second one I just noticed when looking at it. I don't feel strongly
about it so not sure if we should do it or not, but seems like the
empty metric exclusion from the JSON should be consistent if we're going
to have it at all.

James Clark (2):
  perf stat: Fix trailing comma when there is no metric unit
  perf stat: Also hide metric from JSON if units are an empty string

 .../tests/shell/lib/perf_json_output_lint.py  |  14 +-
 tools/perf/util/stat-display.c                | 179 ++++++++++--------
 2 files changed, 105 insertions(+), 88 deletions(-)

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2.34.1