tmf: Fix superfluous Supplementary files element in trace package import

When importing a trace package without supplementary files, a superfluous
supplementary files element was shown in the tree. This is a regression caused
by a previous patch that changes the way to handle children.

Change-Id: I30b505b623973badb2b1ac94fe39347f24c5a15c
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/36089
Tested-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
tmf: Bug 434646: Control Flow view not cleared when opening UST trace

Change-Id: Ifb0812fb1323a00d011bfddadb7ca8ae8849c8d9
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/35653
Tested-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>