Rails3: scm: darcs: fix error of test_entries_invalid_revision at unit model test
On Rails 3.1, ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection error raises. For more details, see r7062.
Authored by: tmaruyama 2011-09-12
Parent: [r7118]
Child: [r7120]
