When the catch all is hit the exit statement only returns from
the case statement. Remove the exit statement.
Check that some sha was returned, otherwise empty input
sha will result in empty calculated sha, which causes
false positive sha check.
Pick-to: 6.7
Change-Id: Iddb9562cf7e12f695e21ca63b302c9217fc98aab
Reviewed-by: Dimitrios Apostolou <jimis@qt.io>