Update bootstrap.php

Temporary crutch for update from rev.48-

app/bootstrap.php

@@ -13,6 +13,7 @@ namespace ForkBB;
 use ForkBB\Core\Container;
 use ForkBB\Core\ErrorHandler;
 use ForkBB\Models\Page;
+use Exception;
 use RuntimeException;
 
 \error_reporting(\E_ALL ^ \E_NOTICE);
@@ -56,20 +57,30 @@ if (
 } else {
     $c->BASE_URL = \str_replace('https://', 'http://', $c->BASE_URL);
 }
-$c->PUBLIC_URL = $c->BASE_URL . $forkPublicPrefix;
 
 $c->FORK_REVISION = 48;
 $c->START         = $forkStart;
-$c->DIR_APP       = __DIR__;
-$c->DIR_PUBLIC    = \realpath(__DIR__ . '/../public');
-$c->DIR_CACHE     = __DIR__ . '/cache';
-$c->DIR_VIEWS     = __DIR__ . '/templates';
-$c->DIR_LANG      = __DIR__ . '/lang';
-$c->DIR_LOG       = __DIR__ . '/log';
-$c->DATE_FORMATS  = ['Y-m-d', 'd M Y', 'Y-m-d', 'Y-d-m', 'd-m-Y', 'm-d-Y', 'M j Y', 'jS M Y'];
-$c->TIME_FORMATS  = ['H:i:s', 'H:i', 'H:i:s', 'H:i', 'g:i:s a', 'g:i a'];
+$c->PUBLIC_URL    = $c->BASE_URL . $forkPublicPrefix;
+
+// Temporary crutch for update from rev.48-
+try {
+    $e = $c->DIR_ROOT;
+} catch (Exception $e) {
+    $c->DIR_APP       = __DIR__;
+    $c->DIR_PUBLIC    = \realpath(__DIR__ . '/../public');
+    $c->DIR_CACHE     = __DIR__ . '/cache';
+    $c->DIR_CONFIG    = __DIR__ . '/config';
+    $c->DIR_VIEWS     = __DIR__ . '/templates';
+    $c->DIR_LANG      = __DIR__ . '/lang';
+    $c->DIR_LOG       = __DIR__ . '/log';
+    $c->DATE_FORMATS  = ['Y-m-d', 'd M Y', 'Y-m-d', 'Y-d-m', 'd-m-Y', 'm-d-Y', 'M j Y', 'jS M Y'];
+    $c->TIME_FORMATS  = ['H:i:s', 'H:i', 'H:i:s', 'H:i', 'g:i:s a', 'g:i a'];
+} finally {
+    unset($e);
+}
 
 $controllers = ['Primary', 'Routing'];
+
 foreach ($controllers as $controller) {
     $page = $c->{$controller};