cmdline client: Improve error message when passing an empty TraceConfig
cmdline client: Improve error message when passing an empty TraceConfig

Bug: 73629036
Change-Id: I46e3f6ec32a6eb40df277ef9a109e384694891f2

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto