#i123862# use O*String's isEmpty() method to check for emptiness in modules starting with 'a'

Patch-by: j.nitschke@ok.de
Review-by: hdu@apache.org
#i123862# use O*String's isEmpty() method to check for emptiness in modules starting with 'b'

Patch-by: j.nitschke@ok.de
Review-by: hdu@apache.org