ArrayUnmarshaller return None on nullable

Author: jgod

openapi_core/unmarshalling/schemas/unmarshallers.py

@@ -144,7 +144,8 @@ def items_unmarshaller(self):
 
     def __call__(self, value=NoValue):
         value = super(ArrayUnmarshaller, self).__call__(value)
-
+        if value is None and self.schema.nullable:
+            return None
         return list(map(self.items_unmarshaller, value))