Cannot specify revision like 1000.1.23

[Aliaksei Vasileuski]

Cannot specify revision like 1000.1.23, only simple numbers are accepted by bzr-undelete.

[Parth Malwankar (parthm)]

[foobar]% bzr log -n 0
    3 Parth Malwankar 2010-03-21
      added x

    2 Parth Malwankar 2010-03-21 [merge]
      merged barfoo

          1.1.2 Parth Malwankar 2010-03-21
                removed hello

          1.1.1 Parth Malwankar 2010-03-21
                updated

    1 Parth Malwankar 2010-03-21
      initial

[foobar]% bzr undelete -r 1.1.1 hello
bzr: ERROR: exceptions.TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    attaching the crash file
        /home/parthm/.cache/crash/bzr-20100321024101-2716.crash
    and including a description of the problem.

    The crash file is plain text and you can inspect or edit it to remove
    private information.
[foobar]%