Fix #317 - added missing check/init

Author: theseer

src/shared/FileInfoCollection.php

@@ -16,7 +16,7 @@ class FileInfoCollection implements \Iterator, \Countable {
         /**
          * @var int
          */
-        private $pos;
+        private $pos = 0;
 
         /**
          * @param FileInfo $file
@@ -27,8 +27,12 @@ public function add(FileInfo $file) {
 
         /**
          * @return FileInfo
+         * @throws \TheSeer\phpDox\FileInfoCollectionException
          */
         public function current() {
+            if (!isset($this->data[$this->pos])) {
+                throw new FileInfoCollectionException('Empty collection');
+            }
             return $this->data[$this->pos];
         }
 

src/shared/FileInfoCollectionException.php

@@ -0,0 +1,7 @@
+<?php declare(strict_types=1);
+
+namespace TheSeer\phpDox;
+
+class FileInfoCollectionException extends \Exception {
+
+}