natargs: return None when no function handles an argument

1 files changed, 2 insertions, 0 deletions

diff --git a/natargs.py b/natargs.py
index 1598f17..664db9e 100644
--- a/natargs.py
+++ b/natargs.py
@@ -39,6 +39,8 @@ def getarg(dict, l):
 	else:
 		resolved = getarg(dict[l[0]].st, l[1:])
 		if resolved is None:
+			if dict[l[0]].f is None:
+				return None
 			return dict[l[0]].f,l[1:] \
 			       if dict[l[0]].dochk(l[1:]) \
 			       else None