5534 add docker

config/inc_projects_config.php

 <?php
-$aConfig = array_replace_recursive(
-    include('config_defaults.php'),
-    include('config_custom.php')
-)
-;
+
+$aConfig = include('config_defaults.php');
+if (file_exists('config_custom.php')){
+    $aConfig = array_replace_recursive(
+        $aConfig,
+        include('config_custom.php')
+    );    
+}
 
 // ----------------------------------------------------------------------
 // generate some vars