bug #54 Fix #42 - Invalid argument supplied for foreach (cve)

This PR was merged into the 1.0.x-dev branch.

Discussion
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Fix #42 - Invalid argument supplied for foreach

 Warning: Invalid argument supplied for foreach()

Commits
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c235bd0 Fix #42 - Invalid argument supplied for foreach when no shared files and dirs setup

Author: javiereguiluz

Diff for: src/Configuration/DefaultConfiguration.php

@@ -54,8 +54,8 @@ final class DefaultConfiguration extends AbstractConfiguration
     private $permissionMode = '0777';
     private $permissionUser;
     private $permissionGroup;
-    private $sharedFiles;
-    private $sharedDirs;
+    private $sharedFiles = [];
+    private $sharedDirs = [];
     private $resetOpCacheFor;
 
     public function __construct(string $localProjectDir)