FIX crash when removing player while finance window open

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6537 8aca7d54-2c30-db11-9de9-000461428c89
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git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6538 8aca7d54-2c30-db11-9de9-000461428c89