OpenACS

1.  Blank parameters were listed as being of "No Value", and when you hit

   "set parameters" this string replaced the empty string in the database,

   not exactly what you want.  I changed the code to leave the input box

   blank.

2.  caching of empty parameter strings didn't work.  I'd fixed this earlier

   for ad_parameter proper but missed the fact that ad_parameter_cache had

   the same bug.

With these changes you can now run acs-workflow's admin UI without graphviz

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