Fix misspelling of method `.present?`

ee/app/views/admin/_namespace_plan_badge.html.haml

 - namespace = local_assigns.fetch(:namespace)
-- return unless Gitlab::CurrentSettings.should_check_namespace_plan? && namespace.plan.present
+- return unless Gitlab::CurrentSettings.should_check_namespace_plan? && namespace.plan.present?
 
 %span.plan-badge.has-tooltip{ data: { plan: namespace.plan.name }, title: "#{namespace.plan.title} Plan" }
   = custom_icon('icon_premium')

ee/spec/views/admin/users/index.html.haml_spec.rb

 require 'rails_helper'
 
 describe 'admin/users/index' do
-  it 'includes "Send email to users" link' do
+  let(:should_check_namespace_plan) { false }
+
+  before do
+    allow(Gitlab::CurrentSettings).to receive(:should_check_namespace_plan?)
+      .and_return(should_check_namespace_plan)
     allow(view).to receive(:container_class).and_return('ignored')
+    create(:user) # to have at least one usser
     assign(:users, User.all.page(1))
 
     render
+  end
 
+  it 'includes "Send email to users" link' do
     expect(rendered).to have_link 'Send email to users', href: admin_email_path
   end
+
+  context 'when Gitlab::CurrentSettings.should_check_namespace_plan is true' do
+    let(:should_check_namespace_plan) { true }
+
+    it 'includes "Send email to users" link' do
+      expect(rendered).to have_link 'Send email to users', href: admin_email_path
+    end
+  end
 end