Bug 1979921: Allow for checking if $group id is integer

Currently we only check if string or class when calling
View::get_artefactchooser_artefacts() and dealing with group
information.

Change-Id: Ifd3bcbd46db87ccdd44ce257b8a40a300702fe4d
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
(cherry picked from commit 56dfed7f)