Update README and questionController.ts (#42)

- README: Update details on getTopics
- questionController: Remove if check on getTopics

Author: KhoonSun47

services/question/README.md

@@ -6,7 +6,6 @@
 
 ```cmd
 cp .env.sample .env
-cp services/question/.env.sample services/question/.env
 ```
 
 2. After setting up the .env files, build the Docker images and start the containers using the following command:
@@ -247,7 +246,6 @@ This endpoint retrieves all unique topics in the database
 | Response Code               | Explanation                                                         |
 |-----------------------------|---------------------------------------------------------------------|
 | 200 (OK)                    | Success, all topics are returned.                                   |
-| 404 (Not Found)             | No topic found.                                                     |
 | 500 (Internal Server Error) | The server encountered an error and could not complete the request. |
 
 ### Command Line Example:

services/question/src/controllers/questionController.ts

@@ -129,10 +129,6 @@ export const getTopics = async (req: Request, res: Response) => {
     try {
         const topics = await Question.distinct('topics');
 
-        if (!topics || topics.length === 0) {
-            return handleNotFound(res, 'No topics found');
-        }
-
         handleSuccess(res, 200, 'Topics retrieved successfully', topics);
     } catch (error) {
         console.error('Error in getTopics:', error);