Fixed rendering bug with .Schema() being called again.

Should have known better, almost there with accuracy now.

Signed-off-by: Dave Shanley <dave@quobix.com>

what-changed/model/response.go

@@ -160,6 +160,8 @@ func CompareResponse(l, r any) *ResponseChanges {
 
 	CheckProperties(props)
 	rc.Changes = changes
+	if rc.TotalChanges() <= 0 {
+		return nil
+	}
 	return rc
-
 }