Usability enhancement: "Good news" feedback is returned like an error when a defined custom search API returns something

[wrigleyDan]

Is your feature request related to a problem? Please describe.
When defining a custom search API endpoint and the response cannot be parsed appropriately by the Javascript mapping function the following message is shown to the user:

From a usability point of view it is not ideal that this partially successful message ("Good news") is shown as an error.

Describe the solution you'd like
Not being a UX expert I'm suggesting two options:

1. either show the whole message in yellow instead of red as there is something going in the right direction (there is a response) but not all is working (the Javascript code needs some love)
2. split the message in two parts, showing the part that is good in green and the part that is bad in red.

Describe alternatives you've considered

Additional context
Reproduction:

Proxy Requests activated