Fix build with Qt < 5.14
Qt::SkipEmptyParts was itnroduced with Qt 5.14 [1]. Introduced with 82de62b0e630d6d370a3b9f091a0fa5c587e215e.
[1] https://doc-snapshots.qt.io/qt5-5.14/qt.html#SplitBehaviorFlags-enum