doctrine/doctrine2 — pull request #566 by BenMorel (2013-02-03 01:40:45+00:00)
Title: Added missing return statement to AbstractCommand.

The `AbstractCommand::execute()` method should return an `integer`, or `null`.

Although in PHP, omitting the `return` statement is equivalent to returning `null`, it is recommended to put an explicit `return` to clearly differentiate it from `return void`.

I've added `return 0;` here, keeping the existent behavior.