Update packer.py
Update packer.py

added case, that radix is [] (default), and not numeric
bitwiseman/js-beautify,beautify-web/js-beautify,bitwiseman/js-beautify,beautify-web/js-beautify,beautify-web/js-beautify,bitwiseman/js-beautify,beautify-web/js-beautify,bitwiseman/js-beautify