Fix backend specs

ee/app/helpers/ee/services_helper.rb

@@ -18,7 +18,7 @@ module EE
           show_jira_issues_integration: @project&.feature_available?(:jira_issues_integration).to_s,
           enable_jira_issues: integration.issues_enabled.to_s,
           project_key: integration.project_key,
-          gitlab_issues_enabled: @project.issues_enabled?.to_s,
+          gitlab_issues_enabled: @project&.issues_enabled?.to_s,
           upgrade_plan_path: @project && ::Gitlab::CurrentSettings.should_check_namespace_plan? ? upgrade_plan_path(@project.group) : nil,
           edit_project_path: @project ? edit_project_path(@project, anchor: 'js-shared-permissions') : nil
         )

ee/spec/helpers/ee/services_helper_spec.rb

@@ -20,6 +20,10 @@ RSpec.describe EE::ServicesHelper do
   describe '#integration_form_data' do
     subject { helper.integration_form_data(integration) }
 
+    before do
+      assign(:project, project)
+    end
+
     context 'Slack service' do
       let(:integration) { build(:slack_service) }