Rails3: scm: git: fix error of test_fetch_changesets_invalid_rev at unit model test
On Rails 3.1, ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection error raises. For more details, see r7062.
Authored by: tmaruyama 2011-09-07
Parent: [r7069]
Child: [r7071]
