Hide headings with no investments

The page should not show any headings which don't have any
winning investments. The "no content" message should only be
shown when there are no headings with investments to avoid an
otherwise blank page.

__Note:__ in the main @headings query, _both_ #includes and #joins
are needed to:
 1. eager load all necessary data (#includes)
and
 2. to perform an INNER JOIN on milestones to filter out investments
with no milestones (#joins).

spec/features/budgets/executions_spec.rb

@@ -27,7 +27,9 @@ feature 'Executions' do
     expect(page).not_to have_content(investment4.title)
   end
 
-  scenario 'render a message for headings without winner investments' do
+  scenario "Do not display headings with no winning investments for selected status" do
+    create(:budget_investment_milestone, investment: investment1)
+
     empty_group   = create(:budget_group, budget: budget)
     empty_heading = create(:budget_heading, group: empty_group, price: 1000)
 
@@ -38,11 +40,25 @@ feature 'Executions' do
     expect(page).to have_content(empty_heading.name)
 
     click_link 'Milestones'
-    click_link "#{empty_heading.name}"
 
-    expect(page).to have_content('No winner investments for this heading')
+    expect(page).to have_content(heading.name)
+    expect(page).not_to have_content(empty_heading.name)
   end
 
+  scenario "Show message when there are no winning investments with the selected status", :js do
+    create(:budget_investment_status, name: I18n.t('seeds.budgets.statuses.executed'))
+
+    visit budget_path(budget)
+
+    click_link 'See results'
+    click_link 'Milestones'
+
+    expect(page).not_to have_content('No winner investments in this state')
+
+    select 'Executed', from: 'status'
+
+    expect(page).to have_content('No winner investments in this state')
+  end
 
   context 'Images' do
     scenario 'renders milestone image if available' do
@@ -157,7 +173,6 @@ feature 'Executions' do
       select 'Studying the project', from: 'status'
 
       expect(page).not_to have_content(investment1.title)
-      expect(page).to have_content('No winner investments for this heading')
 
       select 'Bidding', from: 'status'