changing fields in account is done and upd chats retrieval

stubs/api/change/index.js

@@ -16,6 +16,7 @@ changeRouter.post('/nickname', (req, res) => {
     // Invalid identification
     if (!user) {
         res.status(401).send({message: 'Invalid credentials (id)'});
+        return;
     }
 
     const updatedUser = {
@@ -42,6 +43,7 @@ changeRouter.post('/password', (req, res) => {
     // Invalid identification
     if (!user) {
         res.status(401).send({message: 'Invalid credentials (id)'});
+        return;
     }
 
     // Delete the old one