Don't show inspector groups of there are no properties
A inspector group with no properties, should not be shown.
Therefore, check if the iterated inspectorgroup has any properties, or else just continue to next iteration
[TASK] Hide empty inspector groups
An inspector group with no properties should not be shown.
Releases: master, 1.1
Reviewed-by: Sebastian Kurfuerst
Tested-by: Sebastian Kurfuerst
(cherry picked from commit 79bdf24aa07a001e0fc05ce5cf76374f0ba400e1)