[Translation][MoFileLoader] fixed load empty translation.

src/Symfony/Component/Translation/Loader/MoFileLoader.php

@@ -137,6 +137,10 @@ class MoFileLoader extends ArrayLoader implements LoaderInterface
             $length = $this->readLong($stream, $isBigEndian);
             $offset = $this->readLong($stream, $isBigEndian);
 
+            if ($length < 1) {
+                continue;
+            }
+
             fseek($stream, $offset);
             $translated = fread($stream, $length);
 

src/Symfony/Component/Translation/Tests/Loader/MoFileLoaderTest.php

@@ -57,4 +57,15 @@ class MoFileLoaderTest extends \PHPUnit_Framework_TestCase
         $resource = __DIR__.'/../fixtures/empty.mo';
         $loader->load($resource, 'en', 'domain1');
     }
+
+    public function testLoadEmptyTranslation()
+    {
+        $loader = new MoFileLoader();
+        $resource = __DIR__.'/../fixtures/empty-translation.mo';
+        $catalogue = $loader->load($resource, 'en', 'message');
+
+        $this->assertEquals(array(), $catalogue->all('message'));
+        $this->assertEquals('en', $catalogue->getLocale());
+        $this->assertEquals(array(new FileResource($resource)), $catalogue->getResources());
+    }
 }