Merge pull request #33 from charliemcratgear4music/fix-toString-on-st…

…ring

Fixes bug when trying to call toString on a string

src/FileParser/FileParser.php

@@ -154,7 +154,7 @@ protected function processStatements($file, array $statements, $prefix = '')
 
                         if ($type instanceof NullableType) {
                             $type = $type->type->toString();
-                        } elseif ($type !== null) {
+                        } elseif ($type instanceof NodeAbstract) {
                             $type = $type->toString();
                         }