configuration improvements (#1784)

src/DependencyInjection/AppExtension.php

@@ -52,7 +52,9 @@ class AppExtension extends Extension
         $config['export']['documents'] = array_merge($config['export']['documents'], $config['export']['defaults']);
         unset($config['export']['defaults']);
 
-        // safe alternatives to %kernel.project_dir%
+        if (empty($config['data_dir'])) {
+            $config['data_dir'] = $container->getParameter('kernel.project_dir') . '/var/data';
+        }
         $container->setParameter('kimai.data_dir', $config['data_dir']);
         $container->setParameter('kimai.plugin_dir', $container->getParameter('kernel.project_dir') . '/var/plugins');
 

src/DependencyInjection/Configuration.php

@@ -37,9 +37,13 @@ class Configuration implements ConfigurationInterface
         $node
             ->children()
                 ->scalarNode('data_dir')
-                    ->isRequired()
+                    ->defaultNull()
                     ->validate()
                         ->ifTrue(function ($value) {
+                            if (null === $value) {
+                                return false;
+                            }
+
                             return !file_exists($value);
                         })
                         ->thenInvalid('Data directory does not exist')