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Fix a crash in Workspace::initializeX11()

Vlad Zahorodnii requested to merge work/zzag/query-tree-children-crash into master

kwin can fail to query root window's children, in which case it can dereference a null pointer at

QList<Xcb::WindowAttributes> windowAttributes(tree->children_len);
QList<Xcb::WindowGeometry> windowGeometries(tree->children_len);

SENTRY: KWIN-7P5

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