MSI: Empty strings are not equal to any number

[Mike McCormack]

ChangeLog:
Empty strings are not equal to any number, so all comparisons against
  them fail except for tests for non-equalness.

  dlls/msi/cond.y          |   10 ++++++++--
  dlls/msi/tests/package.c |   20 ++++++++++++++++++++
  2 files changed, 28 insertions(+), 2 deletions(-)

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