Merge branch 'sh-fix-issue-31215-2' into 'master'

Based on !10841 Fix Error 500 when referencing issue with project in pending delete

Closes #31215

See merge request !10843

app/models/issue.rb

@@ -201,7 +201,7 @@ class Issue < ActiveRecord::Base
   # Returns `true` if the current issue can be viewed by either a logged in User
   # or an anonymous user.
   def visible_to_user?(user = nil)
-    return false unless project.feature_available?(:issues, user)
+    return false unless project && project.feature_available?(:issues, user)
     user ? readable_by?(user) : publicly_visible?
   end

changelogs/unreleased/sh-fix-issue-31215-2.yml

+---
+title: Fix error when an issue reference has a pending deleting project
+merge_request: 10843
+author:

spec/lib/banzai/redactor_spec.rb

@@ -42,6 +42,31 @@ describe Banzai::Redactor do
       end
     end
+    context 'when project is in pending delete' do
+      let!(:issue) { create(:issue, project: project) }
+      let(:redactor) { described_class.new(project, user) }
+
+      before do
+        project.update(pending_delete: true)
+      end
+
+      it 'redacts an issue attached' do
+        doc = Nokogiri::HTML.fragment("<a class='gfm' data-reference-type='issue' data-issue='#{issue.id}'>foo</a>")
+
+        redactor.redact([doc])
+
+        expect(doc.to_html).to eq('foo')
+      end
+
+      it 'redacts an external issue' do
+        doc = Nokogiri::HTML.fragment("<a class='gfm' data-reference-type='issue' data-external-issue='#{issue.id}' data-project='#{project.id}'>foo</a>")
+
+        redactor.redact([doc])
+
+        expect(doc.to_html).to eq('foo')
+      end
+    end
+
     context 'when reference visible to user' do
       it 'does not redact an array of documents' do
         doc1_html = '<a class="gfm" data-reference-type="issue">foo</a>'