Unhandled exception: Exception: Unable to load E:/ZeroNet-win-dist-win64/data/sites.json: Expecting value: line 1 column 1 (char 0)

### Step 1: Please describe your environment

* ZeroNet version: _____
* Operating system: _____
* Web browser: _____
* Tor status: not available/always/disabled
* Opened port: yes/no
* Special configuration: ____

### Step 2: Describe the problem:

#### Steps to reproduce:

1. _____
2. _____
3. _____

#### Observed Results:

* What happened? This could be a screenshot, a description, log output (you can send log/debug.log file to hello@zeronet.io if necessary), etc.

#### Expected Results:

* What did you expect to happen?

The report points to data/sites.json and an exception stating that its JSON cannot be parsed. First obtain the missing ZeroNet version, operating system, browser, Tor and port status, reproduction steps, and relevant log output; done requires a reproducible cause and a verified resolution for loading this file.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.