Handled empty email header (#13)

superset/header_auth_security_manager.py

@@ -120,7 +120,7 @@ def __get_or_create_custom_role(self, role_name: str):
         role = ab_security_manager.find_role(role_name)
         if role:
             return role
-        
+
         alpha_role = ab_security_manager.find_role("Alpha")
         if alpha_role:
             alpha_permissions = alpha_role.permissions
@@ -149,6 +149,9 @@ def __create_or_update_user(self, username):
 
         # Get user info from request headers
         email = self.__get_email_from_request(request)
+        if email is None:
+            email = f'{username}@email.notfound'
+
         first_name = username
         last_name = "-"
         is_platform_admin = self.__PLATFORM_ADMIN_ROLE in self.__get_groups_from_request(request)