Fix: flt.utils.muxer: don't clear an empty `GPtrArray`
GLib < 2.48.0 asserts when clearing an empty `GPtrArray` with
g_array_remove_range():
GLib-CRITICAL **: g_ptr_array_remove_range: assertion
`index_ < array->len' failed
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Change-Id: If9dad0869404ec72ee15724b72ad88780b671619
Reviewed-on: https://review.lttng.org/c/babeltrace/+/1725
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
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