[PATCH 2/3] perf list: Do not print 'Metric Groups:' unnecessarily

[Namhyung Kim]

It was printed unconditionally even if nothing is printed.
Check if the output list empty when filter is given.

Before:
  $ ./perf list duration

  List of pre-defined events (to be used in -e):

    duration_time                                      [Tool event]

  Metric Groups:

After:
  $ ./perf list duration

  List of pre-defined events (to be used in -e):

    duration_time                                      [Tool event]

Signed-off-by: Namhyung Kim <namhy...@kernel.org>

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 8831b964288f..38464d7d2d63 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -535,10 +535,12 @@ void metricgroup__print(bool metrics, bool metricgroups, 
char *filter,
                }
        }
 
-       if (metricgroups && !raw)
-               printf("\nMetric Groups:\n\n");
-       else if (metrics && !raw)
-               printf("\nMetrics:\n\n");
+       if (!filter || !rblist__empty(&groups)) {
+               if (metricgroups && !raw)
+                       printf("\nMetric Groups:\n\n");
+               else if (metrics && !raw)
+                       printf("\nMetrics:\n\n");
+       }
 
        for (node = rb_first_cached(&groups.entries); node; node = next) {
                struct mep *me = container_of(node, struct mep, nd);
-- 
2.28.0.526.ge36021eeef-goog