Unhandled exception: Exception: Unable to load C:/Applications/ZeroNet/data/sites.json: Invalid control character at: line 113 column 9 (char 4096)

### 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?

Inspect data/sites.json around line 113 and the code path that loads it to determine how the malformed JSON reaches the exception. Reproduce the failure with the reported file and define completion as handling or reporting this invalid state without an unhandled exception.

Written by the indexing model from the issue text.