Undescriptive crash clientside when extending non-existing fields

[N247S]

Issue Not sure if it is a 'breaking change' or a mis-informative error. Basically an exception is thrown clientside when a panel-field plugin tries to extend a non-existing field.

Extending non-existing fields was ignored before the latest version (tested on 3.4.4), but is currently breaking the entire panel (tested on 3.5.3.1)

example code for the plugin (only index.js for brevity)

panel.plugin('my/plugin',
{
    fields:
    {
        myField:
        {
            extends: "non-existing-field",
        }
    }
}

Current view of the error clientside (for reference)

Kirby Version tested on version 3.5.3.1

[distantnative]

✅ will be fixed with 3.6.0