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QCborValue: fix incorrect to{Array,Map} when the value is empty

Andreas Sturmlechner requested to merge asturmlechner/qtbase:asturmlechner/QCborValue-dd-nullptr-UB into kde/5.15 
When QCborValue referred to an empty array or map, toArray() and toMap()
would respectively return the default value instead of the empty object,
as expected.

Pick-to: 6.2 6.3
Change-Id: I5e52dc5b093c43a3b678fffd16b60456d0037ad7
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
(cherry picked from commit de6ced66920600e659dbaa2509526a3bcb0b3360)

I stumbled over this via qt/backports-tracker#1944 (closed) which cites this commit, even if it has no Pick-to 5.15. Code looks exactly the same; probably should have been picked?

Edited by Andreas Sturmlechner

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