Fixes a type mismatch when rendering tags with private pipelines

app/finders/ci/commit_statuses_finder.rb

@@ -12,7 +12,7 @@ module Ci
     end
 
     def execute
-      return [] unless Ability.allowed?(@current_user, :read_pipeline, @project)
+      return {} unless Ability.allowed?(@current_user, :read_pipeline, @project)
 
       commit_statuses
     end

spec/finders/ci/commit_statuses_finder_spec.rb

@@ -152,8 +152,8 @@ RSpec.describe Ci::CommitStatusesFinder, '#execute' do
         project.project_feature.update!(builds_access_level: ProjectFeature::PRIVATE)
       end
 
-      it 'returns nil' do
-        expect(subject).to be_empty
+      it 'returns a blank hash' do
+        expect(subject).to eq({})
       end
     end
 
@@ -170,8 +170,8 @@ RSpec.describe Ci::CommitStatusesFinder, '#execute' do
           status: :running)
       end
 
-      it 'returns nil' do
-        expect(private_subject).to be_empty
+      it 'returns a blank hash' do
+        expect(private_subject).to eq({})
       end
     end
   end

spec/views/projects/tags/index.html.haml_spec.rb

@@ -81,5 +81,14 @@ RSpec.describe 'projects/tags/index.html.haml' do
 
       expect(page.all('.tags .content-list li')).not_to have_css 'svg.s24'
     end
+
+    it 'shows no build status or placeholder when pipelines are private' do
+      project.project_feature.update!(builds_access_level: ProjectFeature::PRIVATE)
+      assign(:tag_pipeline_statuses, Ci::CommitStatusesFinder.new(project, project.repository, build(:user), tags).execute)
+
+      render
+
+      expect(page.all('.tags .content-list li')).not_to have_css 'svg.s24'
+    end
   end
 end