msi: fixed MsiGetFileHashW for empty files (try 2)

[Robert van Herk]

In Wine, MsiGetFileHashW fails on empty files. However, in Windows it
just generates a 0 hash. A patch + test is provided.

Try 2's whitespacing is consistent with the rest of the files.
    modified:   dlls/msi/msi.c
    modified:   dlls/msi/tests/msi.c

Kind regards,
Robert van Herk
 		 	   		  
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