If the <dummy> tag can't be found in the data, return an empty string
rather than asserting, so that the test fails gracefully.
Change-Id: I536f08c9c3e942817680849d96d035999d4994db
Task-number: QTBUG-17582
Reviewed-by: Rohan McGovern
(cherry picked from commit a88dd1c5f62b5ded8ea0d76d185127ef28549c72)
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
