ruby/ruby — pull request #575 by sshaw (2014-03-21 22:47:41+00:00)
Title: Fixes for CSV Header Conversion

1st commit: don't try to encode `nil` headers. Currently this causes:
```
NoMethodError: undefined method `encode' for nil:NilClass
```

2nd commit: just makes sense for this converter, I think. Currently leading/trailing whitespace will create: `:_symbol_header` or `:symbol_header_`.