fixture setup does not rely on `AR::Base.configurations`.

As you can also configure your database connection using `ENV["DATABASE_URL"]`,
the fixture setup can't rely on the `.configurations` Hash.

As the fixtures are only loaded when ActiveRecord is actually used
(`rails/test_help.rb`) it should be safe to drop the check for an existing configuration.

Closes https://github.com/ryandotsmith/queue_classic/issues/155

The guard was introduced with a72ace1 more details can be found here: http://web.archive.org/web/20090226044958/http://dev.rubyonrails.org/ticket/5497