Fix LT-19153: Unable to create fully customized writing system
Fix LT-19153: Unable to create fully customized writing system

* Added the code to avoid the crash

gtryus/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,gtryus/libpalaso,sillsdev/libpalaso,sillsdev/libpalaso,gtryus/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso,gtryus/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso