Catch NoWorkingTree rather than NotBranchError.

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index aa35993..19f55ce 100755
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ def get_revno():
     import bzrlib.workingtree
     try:
         t = bzrlib.workingtree.WorkingTree.open_containing(__file__)[0]
-    except bzrlib.errors.NotBranchError:
+    except bzrlib.errors.NoWorkingTree:
         return None
     else:
         return t.branch.revno()