Merge pull request drupal-composer#589 from drupal-composer/dotenv_safeload

Safe-load .env only if exists to prevent fatal error during site install.

Author: Norman Kämper-Leymann

load.environment.php

@@ -6,13 +6,12 @@
  */
 
 use Dotenv\Dotenv;
-use Dotenv\Exception\InvalidPathException;
 
 /**
  * Load any .env file. See /.env.example.
  *
- * Drupal has no official method for loading environment variables and uses 
+ * Drupal has no official method for loading environment variables and uses
  * getenv() in some places.
  */
 $dotenv = Dotenv::createUnsafeImmutable(__DIR__);
-$dotenv->load();
+$dotenv->safeLoad();