SADE does not start if /var/lib/textgrid is missing
Problem: Compile sade build, execute. Stop SADE. Start SADE again. SADE fails to start if the directory /var/lib/textgrid and the files /var/lib/textgrid/charmap.txt /var/lib/textgrid/synonyms.txt are missing.
Please handle this error and just print a clear warning instead.