[Bug]: Evaluated value is hard to understand when empty

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When I click on the `$paramPosition` on a evaluated value of a query and that field is empty, a tooltip show without a value. It's hard to understand that the value is empty. There should be better way to describe the user that field value is empty.

### Steps To Reproduce

1. Create a text widget `MyTextWidget`
2. Create a query that uses a value from the text widget `insert into table_name values ({{MyTextWidget.text}})`
3. Keep the value of `MyTextWidget` empty
4. Now go to the query and click on editor
5. Click on the `$1` of the evaluated value pane

### Environment

Production

### Version

Cloud