[sync]
Null check for last_token.parent
https://github.com/beautify-web/js-beautify/commit/5d6e494a5c28111c830d7f79a6375a36e84d2ac4
Minor clean up of tokenizer code
https://github.com/beautify-web/js-beautify/commit/a8aecf685672a29951befaf6557274a531025cec