Elementor: display post conditionally based upon whether it has a featured image

gistfile1.txt

add_action( 'elementor/theme/register_conditions', function( $conditions_manager ) {
        class Page_Template_Condition extends ElementorPro\Modules\ThemeBuilder\Conditions\Condition_Base {
                public static function get_type() {
                        return 'singular';
                }

                public static function get_priority() {
                        return 30;
                }

                public function get_name() {
                        return 'has_featured_image';
                }

                public function get_label() {
                        return __( 'Has Featured Image' );
                }

                public function check( $args ) {
                        return has_post_thumbnail();   
                }
        }

        $conditions_manager->get_condition( 'singular' )->register_sub_condition( new Page_Template_Condition() );
}, 100 );

This creates a condition to Elementor that lets you display a template based upon whether a page has a featured image or not.