I wrongly assumed we can't query a value with an empty name "" during the previous refactor commit, however, in Windows registry, an empty name for a value means the default value of a key, we can read and write it through the "Default" name. Remove the wrong assert to fix the crash when we are trying to query a default value of a key. Add a new test case to test this kind of scenarios. Amends commit 40523b68c14bf618bdc2d5438deebf34627be3af Fixes: QTBUG-107794 Change-Id: Idacbcb86df4435a8c1ca1c19121599390ae8f3d3 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>