fixing level issue

core/registrar.py

@@ -106,6 +106,7 @@ def add_mask(product):
 
 
 def get_product_type_and_level(metadata_item):
+    level = None
     with access.vsi_open(metadata_item) as f:
         tree = lxml.etree.parse(f)
     root = tree.getroot()