fixed typo and bug

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@528 255f4249-2263-4417-b1ea-8498779e27a7
removed empty code

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@529 255f4249-2263-4417-b1ea-8498779e27a7
as.constparty now coerces to party first (if necessary)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@530 255f4249-2263-4417-b1ea-8498779e27a7