Fix crash when when SETting parent to self or descendant #2412
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Fixes #1414 for both routine operations and invalid typed entries in the JSON Editor.
There is a quirk with the editor that I cannot figure out. Instead of getting red warning text, you get an alert pop-up with the warning. When the pop-up is closed, the invalid parent still shows up in the editor, but it has not been applied.
I tried changing the jeGetContext function in jsonedit.js in the try block. But there were multiple problems with everything I tried.
What is currently in this code is better than what we have and it works as is to prevent crashes and provide warning. But it could be improved.
PR-SERVER-BOT: You can play around with it here: https://test.virtualtabletop.io/PR-2412/pr-test (or any other room on that server)