add display name to missing spots (#36219)

<!-- Add the related story/sub-task/bug number, like Resolves #123, or
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**Related issue:** Resolves #35654 Resolves #36194

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

## Testing

- [x] Added/updated automated tests
- [x] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)

- [x] QA'd all new/changed functionality manually

For unreleased bug fixes in a release candidate, one of:

- [x] Confirmed that the fix is not expected to adversely impact load
test results

server/ptr/ptr.go

@@ -76,3 +76,15 @@ func Duration(x time.Duration) *time.Duration {
 func T[T any](x T) *T {
 	return &x
 }
+
+// ValOrZero returns the value of x if x is not nil, and the zero value
+// for T otherwise.
+func ValOrZero[T any](x *T) T {
+	var ret T
+
+	if x != nil {
+		return *x
+	}
+
+	return ret
+}