added a test


git-svn-id: https://ilk.uvt.nl/svn/sources/ucto/trunk@16303 12f355fe-0486-481a-ad91-c297ab22b4e3
fixed problem with empty text


git-svn-id: https://ilk.uvt.nl/svn/sources/ucto/trunk@16304 12f355fe-0486-481a-ad91-c297ab22b4e3