Darragh Bailey 2338167e4e Treat non-existant output files as empty files
Replace requiring empty files for tests that produce no output and treat
any non-existant output file candidate as though the output is blank.

This simplifies tests that are intended to trigger exceptions and will
not generate an output.

Change-Id: I978fdabb488bc3e4bc6f22db294d21ca5d68913b
2015-03-23 16:33:41 +00:00
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