MSI: Fix comparison of empty properties to numbers and add test cases.

[Mike McCormack]

ChangeLog:
Fix comparison of empty properties to numbers and add test cases.

  dlls/msi/cond.y          |   30 ++++++++++++++++++++++++--
  dlls/msi/tests/package.c |   54 
++++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 82 insertions(+), 2 deletions(-)

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