Add trigger_source for empty page tracking event

Resolves a javascript error for missing trigger_source.

Changelog: fixed

app/views/projects/_invite_members.html.haml → app/views/projects/_invite_members_empty_project.html.haml

@@ -6,6 +6,7 @@
 .js-invite-members-trigger{ data: { variant: 'confirm',
   classes: 'gl-mb-8 gl-xs-w-full',
   display_text: s_('InviteMember|Invite members'),
+  trigger_source: 'project-empty-page',
   event: 'click_button',
   label: 'invite_members_empty_project' } }
 

app/views/projects/empty.html.haml

@@ -7,7 +7,7 @@
 = render "home_panel"
 = render "archived_notice", project: @project
 
-= render "invite_members" if can_import_members?
+= render 'invite_members_empty_project' if can_import_members?
 
 %h4.gl-mt-0.gl-mb-3
   = _('The repository for this project is empty')

spec/views/projects/empty.html.haml_spec.rb

@@ -64,6 +64,7 @@ RSpec.describe 'projects/empty' do
       expect(rendered).to have_selector('.js-invite-members-modal')
       expect(rendered).to have_selector('[data-label=invite_members_empty_project]')
       expect(rendered).to have_selector('[data-event=click_button]')
+      expect(rendered).to have_selector('[data-trigger-source=project-empty-page]')
     end
 
     context 'when user does not have permissions to invite members' do