return instead of raising StopIteration

mongoengine/queryset/base.py

@@ -1461,7 +1461,7 @@ class BaseQuerySet(object):
         """Wrap the result in a :class:`~mongoengine.Document` object.
         """
         if self._limit == 0 or self._none:
-            raise StopIteration
+            return
 
         raw_doc = self._cursor.next()
 

mongoengine/queryset/queryset.py

@@ -89,10 +89,10 @@ class QuerySet(BaseQuerySet):
                 yield self._result_cache[pos]
                 pos += 1
 
-            # Raise StopIteration if we already established there were no more
+            # return if we already established there were no more
             # docs in the db cursor.
             if not self._has_more:
-                raise StopIteration
+                return
 
             # Otherwise, populate more of the cache and repeat.
             if len(self._result_cache) <= pos: