Fix quote posts with CW and no text being rejected

Fixes #36077

spec/lib/activitypub/activity/create_spec.rb

@@ -887,6 +887,33 @@ RSpec.describe ActivityPub::Activity::Create do
         end
       end
 
+      context 'with an unverifiable quote of a known post, with summary (CW) but no text' do
+        let(:quoted_status) { Fabricate(:status, account: Fabricate(:account, domain: 'example.com')) }
+
+        let(:object_json) do
+          build_object(
+            type: 'Note',
+            summary: 'beware of what she said',
+            content: nil,
+            quote: ActivityPub::TagManager.instance.uri_for(quoted_status)
+          )
+        end
+
+        it 'creates a status with an unverified quote' do
+          expect { subject.perform }.to change(sender.statuses, :count).by(1)
+
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+          expect(status.spoiler_text).to eq 'beware of what she said'
+          expect(status.content).to eq ''
+          expect(status.quote).to_not be_nil
+          expect(status.quote).to have_attributes(
+            state: 'pending',
+            approval_uri: nil
+          )
+        end
+      end
+
       context 'with an unverifiable quote of a known post' do
         let(:quoted_status) { Fabricate(:status) }
 

spec/services/activitypub/process_status_update_service_spec.rb

@@ -600,6 +600,39 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService do
     end
   end
 
+  context 'when the status keeps an unverifiable quote and removes text through an explicit update' do
+    let(:quoted_account) { Fabricate(:account, domain: 'quoted.example.com') }
+    let(:quoted_status) { Fabricate(:status, account: quoted_account) }
+    let!(:quote) { Fabricate(:quote, status: status, quoted_status: quoted_status) }
+
+    let(:payload) do
+      {
+        '@context': [
+          'https://www.w3.org/ns/activitystreams',
+          {
+            '@id': 'https://w3id.org/fep/044f#quote',
+            '@type': '@id',
+          },
+          {
+            '@id': 'https://w3id.org/fep/044f#quoteAuthorization',
+            '@type': '@id',
+          },
+        ],
+        id: 'foo',
+        type: 'Note',
+        summary: 'Show more',
+        updated: '2021-09-08T22:39:25Z',
+        quote: ActivityPub::TagManager.instance.uri_for(quoted_status),
+      }
+    end
+
+    it 'updates the approval URI but does not verify the quote' do
+      expect { subject.call(status, json, json) }
+        .to change(status, :text).to('')
+        .and not_change(quote, :state).from('pending')
+    end
+  end
+
   context 'when the status has an existing verified quote and removes an approval link through an explicit update' do
     let(:quoted_account) { Fabricate(:account, domain: 'quoted.example.com') }
     let(:quoted_status) { Fabricate(:status, account: quoted_account) }