Bootstrap/Load: Confirm the value of WP_ENVIRONMENT_TYPE before using.

This adjusts the check for the presence of the `WP_ENVIRONMENT_TYPE` constant to also confirm it is set to a non-empty value before using.

Props dd32, khokansardar, ramon-fincken.
Fixes #55741.

git-svn-id: https://develop.svn.wordpress.org/trunk@54239 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

src/wp-admin/includes/class-wp-debug-data.php

@@ -236,7 +236,7 @@ public static function debug_data() {
 		}
 
 		// Check WP_ENVIRONMENT_TYPE.
-		if ( defined( 'WP_ENVIRONMENT_TYPE' ) ) {
+		if ( defined( 'WP_ENVIRONMENT_TYPE' ) && WP_ENVIRONMENT_TYPE ) {
 			$wp_environment_type = WP_ENVIRONMENT_TYPE;
 		} else {
 			$wp_environment_type = __( 'Undefined' );

src/wp-includes/load.php

@@ -227,7 +227,7 @@ function wp_get_environment_type() {
 	}
 
 	// Fetch the environment from a constant, this overrides the global system variable.
-	if ( defined( 'WP_ENVIRONMENT_TYPE' ) ) {
+	if ( defined( 'WP_ENVIRONMENT_TYPE' ) && WP_ENVIRONMENT_TYPE ) {
 		$current_env = WP_ENVIRONMENT_TYPE;
 	}