advpack: Rewrite get_parameter to be able to handle an empty parameter [try2]

[James Hawkins]

Hi,

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

 dlls/advpack/files.c |   47 +++++++++++++++++++++++------------------------
 1 files changed, 23 insertions(+), 24 deletions(-)

--
James Hawkins
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