diff -r acabbc5ccd24 -r 6b724caa878d mercurial/obsolete.py
--- a/mercurial/obsolete.py	Sat Sep 30 07:44:45 2017 -0400
+++ b/mercurial/obsolete.py	Sat Sep 30 07:44:55 2017 -0400
@@ -542,7 +542,6 @@
                     raise
                 # just build an empty _all list if no obsstore exists, which
                 # avoids further stat() syscalls
-                pass
         return bool(self._all)
 
     __bool__ = __nonzero__