composer/composer — pull request #2535 by chr0n1x (2013-12-28 05:44:32+00:00)
Title: ConfigValidator: ensure that require-dev exists during override check

- Ensure that require-dev is present before checking for dependeny overrides.
- A small grammar update for the warning message.

This is to address what @jhampton mentioned: https://github.com/composer/composer/issues/2503#issuecomment-31286820