msi: Don't crash if an empty record is given to MsiProcessMessage

[James Hawkins]

Hi,

This fixes bug 5751.  http://bugs.winehq.org/show_bug.cgi?id=5751
Also a quote from msdn on the use of IDOK:

"MsiProcessMessage: IDOK:  The function succeeded."

Changelog:
* Don't crash if an empty record is given to MsiProcessMessage.

 dlls/msi/package.c      |    4 ++++
 dlls/msi/tests/format.c |   26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

--
James Hawkins
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