Fix: src.ctf.fs: trace-info: fields no appended if range not set

Fix: src.ctf.fs: trace-info: fields no appended if range not set

Issue
=====
If the stream range is not set, the entire `if` clause is skipped and
the `paths`, `stream-id`, and `port-name` are not returned by the query
for that stream.

Solution
========
Append the value of this file group info even if the stream range is not
set.

Drawbacks
=========
None.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Change-Id: I7e185bcf3b640a684fc7944423eeb8d337764b19
Reviewed-on: https://review.lttng.org/c/babeltrace/+/1386
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Tested-by: jenkins