Fix CacheBuster being queued for missing media attachments (#34253)

spec/models/media_attachment_spec.rb

@@ -302,6 +302,15 @@ RSpec.describe MediaAttachment, :attachment_processing do
         .to enqueue_sidekiq_job(CacheBusterWorker).with(original_url)
         .and enqueue_sidekiq_job(CacheBusterWorker).with(small_url)
     end
+
+    context 'with a missing remote attachment' do
+      let(:media) { Fabricate(:media_attachment, remote_url: 'https://example.com/foo.png', file: nil) }
+
+      it 'does not queue CacheBusterWorker jobs' do
+        expect { media.destroy }
+          .to_not enqueue_sidekiq_job(CacheBusterWorker)
+      end
+    end
   end
 
   private