render null as null in datagrid

[Laffery]

Feature Request

Description of Problem:

Currently there are several behaviors for rendering data in datagrid as follows:(which I'm not sure whether they're by designed)

• string "null" is rendered as -, which is not null
• null is rendered as -, it's hard to tell whether the value is null or string "-"

Both these behaviors are confused.

Potential Solutions:

It would be great if there is an option to render string "null" as null and render null as null with distinct styles