rails/rails — pull request #7182 by yahonda (2012-07-27 20:01:46+00:00)
Title: Modity the :json_data_empty attribute from `:null => false` to `:null => true`

This pull request address ORA-01400 errors reported in #7178 with Oracle enhanced adapter.

The commit 3c0bf04 requires :json_data_empty `:null => false` OR `:default => ""`. No `:null => false` AND `:default => ""` required.

See https://github.com/rails/rails/issues/7178#issuecomment-7314663 for detail.