More informative error when table cannot be resolved
More informative error when table cannot be resolved

see issue https://github.com/liblouis/liblouis/issues/317

liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,IndexBraille/liblouis,liblouis/liblouis,BueVest/liblouis,hammera/liblouis,IndexBraille/liblouis,hammera/liblouis,BueVest/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,IndexBraille/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,IndexBraille/liblouis,IndexBraille/liblouis,liblouis/liblouis,BueVest/liblouis