fixes issues with listyfing failing too often

lib/ansible/utils/__init__.py

@@ -1469,7 +1469,7 @@ def listify_lookup_plugin_terms(terms, basedir, inject):
             # if not already a list, get ready to evaluate with Jinja2
             # not sure why the "/" is in above code :)
             try:
-                new_terms = template.template(basedir, "{{%s}}" % terms, inject, convert_bare=True, fail_on_undefined=C.DEFAULT_UNDEFINED_VAR_BEHAVIOR)
+                new_terms = template.template(basedir, "{{%s}}" % terms, inject, convert_bare=True)
                 if isinstance(new_terms, basestring) and "{{" in new_terms:
                     pass
                 else: