Better control flow and added guard clause.

lib/gitlab/saml/user.rb

@@ -26,15 +26,13 @@ module Gitlab
           @user ||= build_new_user
         end
 
-        unless @user.nil?
-          if external_users_enabled?
-            # Check if there is overlap between the user's groups and the external groups
-            # setting then set user as external or internal.
-            if (auth_hash.groups & Gitlab::Saml::Config.external_groups).empty?
-              @user.external = false
-            else
-              @user.external = true
-            end
+        if external_users_enabled? && @user
+          # Check if there is overlap between the user's groups and the external groups
+          # setting then set user as external or internal.
+          if (auth_hash.groups & Gitlab::Saml::Config.external_groups).empty?
+            @user.external = false
+          else
+            @user.external = true
           end
         end
 
@@ -50,11 +48,8 @@ module Gitlab
       end
 
       def changed?
-        if gl_user
-          gl_user.changed? || gl_user.identities.any?(&:changed?)
-        else
-          true
-        end
+        return true unless gl_user
+        gl_user.changed? || gl_user.identities.any?(&:changed?)
       end
 
       protected