bzr merge with missing revision error message is too long

[Stewart Smith]

$ bzr merge ~/Desktop/mysqldump.patch
bzr: ERROR: bzrlib.errors.NoSuchRevision: KnitPackRepository('file:///home/stewart/mysql/.bzr/repository/') has no revision ('volpato@cajarana-20080715052545-2fu5im6ll8o2jr6x',)

Traceback (most recent call last):
  File "/home/stewart/lib/python/bzrlib/commands.py", line 857, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/home/stewart/lib/python/bzrlib/commands.py", line 797, in run_bzr
    ret = run(*run_argv)
  File "/home/stewart/lib/python/bzrlib/commands.py", line 499, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/stewart/lib/python/bzrlib/builtins.py", line 2829, in run
    mergeable, pb)
  File "/home/stewart/lib/python/bzrlib/merge.py", line 154, in from_mergeable
    mergeable.get_merge_request(tree.branch.repository)
  File "/home/stewart/lib/python/bzrlib/merge_directive.py", line 541, in get_merge_request
    verified = self._maybe_verify(repository)
  File "/home/stewart/lib/python/bzrlib/merge_directive.py", line 546, in _maybe_verify
    if self._verify_patch(repository):
  File "/home/stewart/lib/python/bzrlib/merge_directive.py", line 527, in _verify_patch
    self.base_revision_id)
  File "/home/stewart/lib/python/bzrlib/merge_directive.py", line 156, in _generate_diff
    tree_1 = repository.revision_tree(ancestor_id)
  File "/home/stewart/lib/python/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/home/stewart/lib/python/bzrlib/repository.py", line 1652, in revision_tree
    inv = self.get_revision_inventory(revision_id)
  File "/home/stewart/lib/python/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/home/stewart/lib/python/bzrlib/repository.py", line 1615, in get_revision_inventory
    return self.get_inventory(revision_id)
  File "/home/stewart/lib/python/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/home/stewart/lib/python/bzrlib/repository.py", line 1508, in get_inventory
    return self.iter_inventories([revision_id]).next()
  File "/home/stewart/lib/python/bzrlib/repository.py", line 1526, in _iter_inventories
    for text, revision_id in self._iter_inventory_xmls(revision_ids):
  File "/home/stewart/lib/python/bzrlib/repository.py", line 1537, in _iter_inventory_xmls
    raise errors.NoSuchRevision(self, record.key)
NoSuchRevision: KnitPackRepository('file:///home/stewart/mysql/.bzr/repository/') has no revision ('volpato@cajarana-20080715052545-2fu5im6ll8o2jr6x',)

bzr 1.6b3 on python 2.5.2 (linux2)
arguments: ['/home/stewart/bin/bzr', 'merge', '/home/stewart/Desktop/mysqldump.patch']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_AU.UTF-8'
plugins:
  bzrtools /home/stewart/.bazaar/plugins/bzrtools [1.6.0]
  diffstat /home/stewart/.bazaar/plugins/diffstat [unknown]
  gtk /home/stewart/.bazaar/plugins/gtk [0.95.0dev1]
  launchpad /home/stewart/lib/python/bzrlib/plugins/launchpad [unknown]
  loom /home/stewart/.bazaar/plugins/loom [1.4.0dev0]
  multiparent /home/stewart/lib/python/bzrlib/plugins/multiparent.py [unknown]
  mysql_plugins /home/stewart/.bazaar/plugins/mysql_plugins [0.3.14]
  rebase /home/stewart/.bazaar/plugins/rebase [0.4.0dev0]
  signing /home/stewart/.bazaar/plugins/signing [unknown]
  svn /home/stewart/.bazaar/plugins/svn [0.4.11exp0]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.

The error message should be better/shorter.