Panel JSON seems to be incorrectly shown

[tobikris]

Describe the problem The Panel JSON seems to be incorrectly shown to the user. This means that you cannot export and import the panel successfully.

To Reproduce Steps to reproduce the behavior (if possible):

1. Create a panel using this plugin.
2. Add two nodes.
3. Add a link between them.
4. Show "Panel JSON" on panel.
5. Click "Save" without any changes.
6. See errors.

Expected behavior The Panel JSON should be correctly exported and therefore allow successful import as well.

Screenshots

VERSIONS! (please complete the following information):

• Firefox 117.0
• Grafana v10.1.0
• Plugin Version 0.4.3

Additional context

• The errors are "random", not always the same attribute is reported as missing.
• The links in the JSON all have the nodes array with two null entries - this seems to be incorrect.