Merge branch 'master' of github.com:ella/ella

Author: honzakral

ella/core/managers.py

@@ -68,7 +68,8 @@ def _retrieve_children(self, category):
     def get_children(self, category, recursive=False):
         #make sure this is the instance stored in our cache
         self._add_to_cache(category)
-        children = self._retrieve_children(category)
+        # copy the returned list. if recursive, we extend it below
+        children = self._retrieve_children(category)[:]
         if recursive:
             to_process = children[:]
             while to_process: