Dont attempt to set email address property for a user upon login

This causes performance issues when logging in. 
```
if (u.getProperty(Mailer.UserProperty.class).getAddress() == null)
```

This ultimately invokes 
```
AbstractProject.hasParticipant()
```
on each and every project. 
We have hundreds of projects and this causes logging in to take forever ( more than 5 minutes) .