The implementation checks the state and returns without storing the
exception when its canceled or finished.
Add tests for both situations.
Done-with: Ivan Solovev <ivan.solovev@qt.io> (analysis and phrasing)
Pick-to: 6.5 6.2
Fixes: QTBUG-128405
Change-Id: I4610a022ea12e1bc9ce24cb17b972b5b9e051f0a
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 6efec3850da188d3bba075185aa6e5c264c815eb)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
5a9c513231