Check for string response on server ping

What does this MR do and why?

Fix handling if a server returns a string instead of json data on socket ping.

Some forge servers will emit a message similar to "server is still starting please wait before reconnecting". This merge request will fix this issue. This issue causes a stack on html page.

MR acceptance checklist

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• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
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