rails/rails — pull request #6801 by dmathieu (2012-06-20 19:23:39+00:00)
Title: Mailer with no implicit template

Currently, if we send an email and use the implicit template with it but not template exists, nothing fails.
I don't think that's the behavior usually intended.

This will raise an `ActionView::MissingTemplate` in that case.
It already occurs like this when rendering an explicit template.