Output doesn't have schema restrictions as input, so fire the hook for output even if no schema is provided

Author: priethor

src/wp-includes/abilities-api/class-wp-ability.php

@@ -584,22 +584,22 @@ protected function do_execute( $input = null ) {
 	protected function validate_output( $output ) {
 		$output_schema = $this->get_output_schema();
 		if ( empty( $output_schema ) ) {
-			return true;
-		}
-
-		$valid_output = rest_validate_value_from_schema( $output, $output_schema, 'output' );
-		if ( is_wp_error( $valid_output ) ) {
-			$is_valid = new WP_Error(
-				'ability_invalid_output',
-				sprintf(
-					/* translators: %1$s ability name, %2$s error message. */
-					__( 'Ability "%1$s" has invalid output. Reason: %2$s' ),
-					esc_html( $this->name ),
-					$valid_output->get_error_message()
-				)
-			);
-		} else {
 			$is_valid = true;
+		} else {
+			$valid_output = rest_validate_value_from_schema( $output, $output_schema, 'output' );
+			if ( is_wp_error( $valid_output ) ) {
+				$is_valid = new WP_Error(
+					'ability_invalid_output',
+					sprintf(
+						/* translators: %1$s ability name, %2$s error message. */
+						__( 'Ability "%1$s" has invalid output. Reason: %2$s' ),
+						esc_html( $this->name ),
+						$valid_output->get_error_message()
+					)
+				);
+			} else {
+				$is_valid = true;
+			}
 		}
 
 		/**