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/files.c |   37 +++++++++++++++----------------------
 1 files changed, 15 insertions(+), 22 deletions(-)

--
James Hawkins
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