./keystone-manage tenant list returns IndexError

$ ./bin/keystone-manage tenant list
ERROR: tuple index out of range
Traceback (most recent call last):
  File "./bin/keystone-manage", line 16, in <module>
    keystone.manage.main()
  File "/Users/antiver/Dropbox/keystone/keystone/manage/__init__.py", line 283, in main
    raise exc
IndexError: tuple index out of range

Although the actual backtrace is being suppressed by main(), it looks like process() is attempting to access args[2] when it's not set in line 112.