remote-bzr: fix old organization destroy

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/remote-helpers/git-remote-bzr

@@ -837,6 +837,8 @@ def get_repo(url, alias):
                 bdir.destroy_repository()
             except bzrlib.errors.NotBranchError:
                 pass
+            except bzrlib.errors.NoRepositoryPresent:
+                pass
 
     try:
         repo = origin.open_repository()