MSI: NULL and empty strings are the same in conditions.

[Mike McCormack]

ChangeLog:
NULL and empty strings are the same in conditions.

  dlls/msi/cond.y          |    8 ++++++--
  dlls/msi/tests/package.c |    6 ++++++
  2 files changed, 12 insertions(+), 2 deletions(-)

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