Removes spacing in QGridLayout when the QWidgets inside of the QGridLayout
are hidden, by checking if the sibling is empty, thus duplicate
spacing can be avoided.
Task-number: QTBUG-52357
Change-Id: I45475e7b264f94ef3bec5f9a4b8cbaa1d53ec6dd
Reviewed-by: Karim Pinter <karim.pinter@theqtcompany.com>
Reviewed-by: Andy Shaw <andy.shaw@theqtcompany.com>