MSI: Fix passing of NULL pointers to MsiDecomposeDescriptor and add a test.

[Mike McCormack]

ChangeLog:
Fix passing of NULL pointers to MsiDecomposeDescriptor and add a test.

  dlls/msi/registry.c |   42 +++++++++++++++++++++++++++---------------
  dlls/msi/tests/db.c |   32 ++++++++++++++++++++++++++------
  2 files changed, 53 insertions(+), 21 deletions(-)

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