advpack: Rewrite get_parameter to be able to handle an empty parameter

[James Hawkins]

Hi,

Changelog:
* Rewrite get_parameter to be able to handle an empty parameter.

 dlls/advpack/advpack.spec |    2 +
 dlls/advpack/files.c      |   74 +++++++++++++++++++++++++++++----------------
 2 files changed, 48 insertions(+), 28 deletions(-)

--
James Hawkins
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