Fix error when following locked accounts (#4896)

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -18,25 +18,48 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
   end
 
   describe 'POST #follow' do
-    let(:other_account) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, username: 'bob')).account }
+    let(:other_account) { Fabricate(:user, email: 'bob@example.com', account: Fabricate(:account, username: 'bob', locked: locked)).account }
 
     before do
       post :follow, params: { id: other_account.id }
     end
 
-    it 'returns http success' do
-      expect(response).to have_http_status(:success)
+    context 'with unlocked account' do
+      let(:locked) { false }
+
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
+
+      it 'returns JSON with following=true and requested=false' do
+        json = body_as_json
+
+        expect(json[:following]).to be true
+        expect(json[:requested]).to be false
+      end
+
+      it 'creates a following relation between user and target user' do
+        expect(user.account.following?(other_account)).to be true
+      end
     end
 
-    it 'returns JSON with following=true and requested=false' do
-      json = body_as_json
+    context 'with locked account' do
+      let(:locked) { true }
 
-      expect(json[:following]).to be true
-      expect(json[:requested]).to be false
-    end
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
 
-    it 'creates a following relation between user and target user' do
-      expect(user.account.following?(other_account)).to be true
+      it 'returns JSON with following=false and requested=true' do
+        json = body_as_json
+
+        expect(json[:following]).to be false
+        expect(json[:requested]).to be true
+      end
+
+      it 'creates a follow request relation between user and target user' do
+        expect(user.account.requested?(other_account)).to be true
+      end
     end
   end