Invalid JSON is saved as empty string

[AntoineLemaire]

Describe the bug
When I have a JSON value, and I do a typo inside, when I save it, it remove everything and save an empty string

To Reproduce

Expected behavior
have a confirm message, or something saying that JSON is invalid before erase everything.
Or at least same the invalid JSON

Environment (please complete the following information):

• OS & version: Linux Mint 20.2
• Redis-Server version : 4.0.14
• RedisDesktopManager version : 2022.2+c787819a

[DrzwiPercepcji]

PR: #5272.