[editor][easy] Remove Confusing 'No Settings Available' Text for Miss…

…ing Settings Property Renderer (#713)

# [editor][easy] Remove Confusing 'No Settings Available' Text for
Missing Settings Property Renderer

It's confusing to have the 'No settings available' text when there's no
renderer available for the type. Instead, just skip renderer for the
property for now. We'll add a JSON editor toggle to the settings drawer
to allow editing any settings, though it won't benefit from a schema
since the prompt schema is not direct 1:1 with JSON schema.

## Before:
![Screenshot 2024-01-02 at 3 13 36
PM](https://github.com/lastmile-ai/aiconfig/assets/5060851/59fb39da-4561-4064-856f-0f346cedf8e4)


## After:
![Screenshot 2024-01-02 at 3 13 20
PM](https://github.com/lastmile-ai/aiconfig/assets/5060851/144c4a96-b009-4f53-84eb-1a9c72805eee)

python/src/aiconfig/editor/client/src/components/SettingsPropertyRenderer.tsx

@@ -419,5 +419,5 @@ export default function SettingsPropertyRenderer({
   }
 
   // TODO: Support toggling to monaco JSON editor at top level
-  return propertyControl ?? <Text>No settings available</Text>;
+  return propertyControl ?? null;
 }