Merge branch '321376-fj-improve-wiki-empty-method' into 'master'

Avoid creating repository when calling Wiki#empty?

See merge request gitlab-org/gitlab!54062

app/models/wiki.rb

@@ -104,7 +104,7 @@ class Wiki
   end
 
   def empty?
-    list_pages(limit: 1).empty?
+    !repository_exists? || list_pages(limit: 1).empty?
   end
 
   def exists?

spec/support/shared_examples/models/wiki_shared_examples.rb

@@ -154,6 +154,15 @@ RSpec.shared_examples 'wiki model' do
       it 'returns true' do
         expect(subject.empty?).to be(true)
       end
+
+      context 'when the repository does not exist' do
+        let(:wiki_container) { wiki_container_without_repo }
+
+        it 'returns true and does not create the repo' do
+          expect(subject.empty?).to be(true)
+          expect(wiki.repository_exists?).to be false
+        end
+      end
     end
 
     context 'when the wiki has pages' do