MAPG-199 fix issues found by PHPStan

src/Cli/MigrateDatabaseCommand.php

@@ -9,7 +9,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 
 class MigrateDatabaseCommand extends Command
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('db:migrate')
             ->setDescription('Migration of database changes.');
@@ -88,6 +88,10 @@ class MigrateDatabaseCommand extends Command
         $path = ROOT . '/database/migrations/' . $type;
         $dir = opendir($path);
 
+        if ($dir === false) {
+            throw new \Exception('Cannot open dir: ' . $path);
+        }
+
         $files = [];
         while ($file = readdir($dir)) {
             $filePath = $path . '/' . $file;