IsEmpty operation and IsNotEmpty operations in SpEL expression not rendering in UI

[afeedhshaji]

Describe the bug When trying to render the query builder UI from the SPeL expression, the is_empty and is_not_empty`

To Reproduce

• Create the following query in the demo builder:
  • user.firstName is empty.
  • The SpEL expression created would be : user.firstName <= ''
• Copy the following SpEL expression: user.firstName <= '' to the demo UI and import it.
• The builder wouldn't render "user.firstName is empty". In fact the builder can't recognize the operator (<=) passed.

Expected behavior

• When the above-mentioned SpEL expression is copied and imported, it should render in the builder: "user.firstName is empty"

Screenshots

Additional context

• The similar bug exists for is not empty operator as well.