Allow createModel() to return a null model on failure (which it already
did in release mode builds), but fail the test gracefully instead of
crashing when a null model is returned.
Change-Id: Iaa0ec31183e0c90fcea512223d01e07ed188a380
Task-number: QTBUG-17582
Reviewed-by: Rohan McGovern
(cherry picked from commit 0d773d839e39f4f4bfd0bf9d652e4f2650adfcb0)
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
