padrino/padrino-framework — pull request #1711 by namusyaka (2014-07-02 20:08:27+00:00)
Title: Avoid editing destination file if it does not exist

If specify lean option and component options which are need to edit the app.rb, an error will occur.
The error can be reproduced by executing this command.
`padrino g project sample --lean --orm=activerecord`
/cc @ujifgc @padrino/core-members