Description of problem:
The email field on the Edit Profile page cannot be empty. The field validation is missing and, if submitted without text in that field, causes a ConstraintViolationException.

Version-Release number of selected component (if applicable):
dev

How reproducible:
Easy always

Steps to Reproduce:
1. Sign in, click Settings on the Dashboard / in menu
2. Click Edit Profile
3. Remove the text from the Email field
4. Press Save

Actual results:
ConstraintViolationImpl{interpolatedMessage='may not be empty', propertyPath=email, rootBeanClass=class org.zanata.model.HPersonEmailValidationKey, messageTemplate='{org.hibernate.validator.constraints.NotEmpty.message}'}

Expected results:
User should not be able to get this far. The field should have the "*" to indicate it is required, and validate empty input for that field.

Additional info: