msi: fixed MsiGetFileHashW for empty files (try 3)

[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 3 incorporates Alexandre's comments: the test-case for an empty file
is now included in the existing test_MsiGetFileHash function.
---
 dlls/msi/msi.c       |   34 ++++++++++++++++++++++------------
 dlls/msi/tests/msi.c |    6 ++++++
 2 files changed, 28 insertions(+), 12 deletions(-)

Kind regards,
Robert van Herk
 		 	   		   		 	   		  
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