[Core] Fix: Submit an empty file input throws error.

Empty file input fields are now ignored by FileCollection::bindValues()

Author: TiSiE

module/Core/src/Core/Form/FileCollection.php

@@ -57,6 +57,9 @@ public function bindValues(array $values = array())
         $collection = $this->getEntityCollection();
 
         foreach ($values as $name => $value) {
+            if (UPLOAD_ERR_OK != $value['error']) {
+                continue;
+            }
             $element = $this->get($name);
 
             $entity = $hydrator->hydrate($value, $this->getEntity());