Rev 5646: Backport switch away from using failUnlessExists and failIfExists in http://bazaar.launchpad.net/~vila/bzr/2.3-integration/

[Vincent Ladeuil]

At http://bazaar.launchpad.net/~vila/bzr/2.3-integration/

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revno: 5646
revision-id: v.ladeuil+lp at free.fr-20110513113444-h0kx3p4z6228v8r8
parent: v.ladeuil+lp at free.fr-20110513105920-5mvhsxckddrmbvnf
committer: Vincent Ladeuil <v.ladeuil+lp at free.fr>
branch nick: 2.3.3-dev
timestamp: Fri 2011-05-13 13:34:44 +0200
message:
  Backport switch away from using failUnlessExists and failIfExists
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