Add email when main email is written

[alexander-schranz]

Q	A
Bug?	yes
New Feature?	no
Sulu Version	develop

Actual Behavior

A mainEmail address needs a email address else it is reseted.

Expected Behavior

When a mainEmail is written it needs to add this mail address also as contact email entity.

Steps to Reproduce

Create a new user with community bundle. Edit the contact in the backend the mainEmail address will be removed.

Possible Solutions

Add the email entity when not exist in the CommunityManager.