patch to be applied over franz existing patch.

feeds_empty_patch_over_patch.patch

diff --git a/mappers/field.inc b/mappers/field.inc
index dd8978c..6c96108 100644
--- a/mappers/field.inc
+++ b/mappers/field.inc
@@ -111,7 +111,7 @@ function _field_feeds_set_target($source, $entity, $target, $value, $input_forma
   $field = isset($entity->$target) ? $entity->$target : array();
   foreach ($value as $v) {
     // Check if field value is empty.
-    if(empty($v[0])){
+    if ((is_array($v) && empty($v[0]) || (!is_array($v) && empty ($v)))) {
       continue;
     }
     if ($v !== FALSE && $v !== NULL && $v !== '') {