[ruby/csv] Fix a bug that write_nil_value or write_empty_value don't work with non String
GitHub: fix GH-123
Reported by asm256. Thanks!!!
https://github.com/ruby/csv/commit/b4492139be
[ruby/csv] Fix a bug that write_nil_value or write_empty_value don't work with non String
GitHub: fix GH-123
Reported by asm256. Thanks!!!
https://github.com/ruby/csv/commit/b4492139be