Validates presence of User#name

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>

lib/api/users.rb

@@ -101,8 +101,6 @@ module Gitlab
         key = current_user.keys.find params[:id]
         key.delete
       end
-
-
     end
   end
 end