The 2 reasons are :
- creation of user fail if name is empty : in after_save, it tries to create a
namespace with namespace.name = user.name and namespece validates presence
Namespace#name
- in the web app links to team members are broken with empty User#name because
they are of the form <a href'...'> user.name </a>

Rewrite and improve git backend logic. Fix project movind. Raise exception to prevent unexpected issues

Project -> update repo only on create and destroy. Fixtures Updated with namespaces. Fixed moving repo