trace-filter: Check that event has filter instead of just trivial
trace-filter: Check that event has filter instead of just trivial

The check for if an event has trivial filter is not enough to
test if the event should be shaded or not. A check of if the
event has any filter is still needed.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd