Fixed function

Author: tfbrito

src/Fields/FileField.php

@@ -57,7 +57,7 @@ public function validate($value)
 
     public function toNative($value)
     {
-        if (is_null($value)) {
+        if ($this->isEmpty($value)) {
             return $value;
         }
         return (object) $value;

src/Validators/FileTypeValidator.php

@@ -24,8 +24,7 @@ public function __construct(array $valid_filetypes, $message = null)
 
     public function __invoke($value)
     {
-        if (isset($value->size) &&
-            $value->size > 0 && !is_null($this->valid_filetypes) && !in_array($value->type, $this->valid_filetypes)) {
+        if ($value->size > 0 && !is_null($this->valid_filetypes) && !in_array($value->type, $this->valid_filetypes)) {
             $message = msg($this->message, array(
                 "valid_types" => implode(", ", $this->valid_filetypes),
                 "type" => $value->type

tests/unit/Fields/FileFieldTest.php

@@ -94,6 +94,12 @@ public function testToNativeInvalidValue()
         $this->assertNull($result);
     }
 
+    public function testToNativeEmptyString()
+    {
+        $result = $this->field->toNative('');
+        $this->assertEquals('', $result);
+    }
+
     /**
      * @expectedException PHPForm\Exceptions\ValidationError
      */