Searching for a string on an "index" page throws an AssertionError when entity does not have any string property

[roland-w-2024]

Describe the bug

Searching for a string on the "index" page of a CRUD controller throws an assert($this->lexer->lookahead !== null) AssertionError when the CRUD controller's entity class does not have any property of type string (with ORM configuration).

Note: Even if no string property is configured to be shown on the "index" page, its existence prevents the error to be thrown.

To Reproduce

1. Create a Product entity class that has an id (integer) and an price (integer) property.
2. Create a CRUD controller for the Product entity
3. Searching for "foo" on the new CRUD controller index page will throw an AssertionError
4. Create a Product::$title (string) property (with ORM configuration)
5. Searching for "foo" on the new CRUD controller page will not throw an AssertionError

(OPTIONAL) Additional context