No value mappings won't be applied to 0


I run a prompt inside a table like this:

count(probe_http_status_code{job=~"foo", environment=~"bar", project=~"baz"} != 200)

When one of the result is other than “200”, the prompt returns the count of results.
When there is no result with value “200”, the prompt returns “No Value” (resp. Empty query result in Prometheus).

I use the following configuration to map “No value” entries:
This works fine for values > 0

However this doesn’t apply for 0:

What else can I do to show “UP” (with green background) instead of the 0?