Fix error when trying to update counters for statuses that are gone (#8251)

spec/models/status_spec.rb

@@ -182,6 +182,27 @@ RSpec.describe Status, type: :model do
       reblog.destroy
       expect(subject.reblogs_count).to eq 0
     end
+
+    it 'does not fail when original is deleted before reblog' do
+      reblog = Fabricate(:status, account: bob, reblog: subject)
+      expect(subject.reblogs_count).to eq 1
+      expect { subject.destroy }.to_not raise_error
+      expect(Status.find_by(id: reblog.id)).to be_nil
+    end
+  end
+
+  describe '#replies_count' do
+    it 'is the number of replies' do
+      reply = Fabricate(:status, account: bob, thread: subject)
+      expect(subject.replies_count).to eq 1
+    end
+
+    it 'is decremented when reply is removed' do
+      reply = Fabricate(:status, account: bob, thread: subject)
+      expect(subject.replies_count).to eq 1
+      reply.destroy
+      expect(subject.replies_count).to eq 0
+    end
   end
 
   describe '#favourites_count' do