Refactor member entity properties to use presenter

Refactor `group_sso` and `group_managed_account` entity properties to
use methods on presenter

ee/app/presenters/ee/group_member_presenter.rb

@@ -5,10 +5,14 @@ module EE
     extend ::Gitlab::Utils::Override
 
     def group_sso?
+      return false unless member.user.present?
+
       member.user.group_sso?(source)
     end
 
     def group_managed_account?
+      return false unless member.user.present?
+
       member.user.group_managed_account?
     end
 

ee/app/serializers/ee/member_entity.rb

@@ -9,13 +9,9 @@ module EE
         can?(current_user, :owner_access, group) && member.user&.using_gitlab_com_seat?(group)
       end
 
-      expose :group_sso do |member|
-        member.user&.group_sso?(group)
-      end
+      expose :group_sso?, as: :group_sso
 
-      expose :group_managed_account do |member|
-        member.user&.group_managed_account?
-      end
+      expose :group_managed_account?, as: :group_managed_account
 
       expose :can_override do |member|
         member.can_override?

ee/spec/presenters/group_member_presenter_spec.rb

@@ -12,6 +12,14 @@ RSpec.describe GroupMemberPresenter do
     let(:saml_provider) { double(:saml_provider) }
     let(:group) { double(:group) }
 
+    context 'when member does not have a user (invited member)' do
+      let(:group_member) { build(:group_member, :invited) }
+
+      it 'returns `false`' do
+        expect(presenter.group_sso?).to eq false
+      end
+    end
+
     it 'calls through to User#group_sso?' do
       expect(user).to receive(:group_sso?).with(group).and_return(true)
 
@@ -20,6 +28,14 @@ RSpec.describe GroupMemberPresenter do
   end
 
   describe '#group_managed_account?' do
+    context 'when member does not have a user (invited member)' do
+      let(:group_member) { build(:group_member, :invited) }
+
+      it 'returns `false`' do
+        expect(presenter.group_managed_account?).to eq false
+      end
+    end
+
     context 'when user is part of the group managed account' do
       before do
         expect(user).to receive(:group_managed_account?).and_return(true)

ee/spec/serializers/member_entity_spec.rb

@@ -20,13 +20,13 @@ RSpec.describe MemberEntity do
     end
 
     it 'correctly exposes `group_sso`' do
-      allow(member.user).to receive(:group_sso?).with(group).and_return(true)
+      allow(member).to receive(:group_sso?).and_return(true)
 
       expect(entity_hash[:group_sso]).to be(true)
     end
 
     it 'correctly exposes `group_managed_account`' do
-      allow(member.user).to receive(:group_managed_account?).and_return(true)
+      allow(member).to receive(:group_managed_account?).and_return(true)
 
       expect(entity_hash[:group_managed_account]).to be(true)
     end