rails/rails — pull request #7008 by seanbehan (2012-07-09 03:30:01+00:00)
Title: Remove nil and blank values from arrays and hashes.

I find myself frequently removing nils and blanks from miscellaneous collections, form params, CSV data, etc. It would be nice if it were just a matter of calling something like...

```ruby
[1,2,nil, '', [3, '']].clean!
# => [1,2, [3]]
```