profiles: add items only if they exists

If no changes were made, the small notifier text would
disappear for a second but no actual profile would be
created. Fix this by showing a small toast.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
cpu: fix stuck min/max frequency

If a core was offlined before it was set to the
right frequency it would get stuck in this stage.

This applies to the per-app profiles as well as
the normal min/max settings.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>