Check if we want to send email for a build before iterating through its users

Signed-off-by: Shea Levy <shea@shealevy.com>

Created by  Shea Levy  on July 5, 2013
J4C4V6GLQUZLVB4JPPDS233YI2MPP6LT3WALHWBXOKRKNKRTWSWQC
Change contents