--- a/mercurial/revset.py	Tue Apr 16 13:22:29 2013 -0500
+++ b/mercurial/revset.py	Wed Apr 17 00:29:54 2013 +0400
@@ -238,12 +238,10 @@
     return [x for x in r if x in s]
 
 def dagrange(repo, subset, x, y):
-    if subset:
-        r = list(repo)
-        xs = _revsbetween(repo, getset(repo, r, x), getset(repo, r, y))
-        s = set(subset)
-        return [r for r in xs if r in s]
-    return []
+    r = list(repo)
+    xs = _revsbetween(repo, getset(repo, r, x), getset(repo, r, y))
+    s = set(subset)
+    return [r for r in xs if r in s]
 
 def andset(repo, subset, x, y):
     return getset(repo, getset(repo, subset, x), y)