Fixed an exception that was caught and improperly forgotten.

mercurial/commands.py

@@ -568,6 +568,7 b' def bundle(ui, repo, fname, dest="defaul'
         f.write(z.flush())
     except:
         os.unlink(fname)
+        raise
 
 def cat(ui, repo, file1, *pats, **opts):
     """output the latest or given revisions of files"""