I recently modified `Cask::DSL` to define instance variables in the
`#initialize` method and this involved some changes to the `language`,
`language_eval`, and `languages` methods. One of those was to
initialize `@language_blocks` to an empty hash instead of using a
`nil` default. I updated the related condition in the `language_eval`
method but I missed that `language_blocks` is used in `Cask::Auditor`
and it specifically relies on a false-y value to check if the variable
is set. An empty hash isn't false-y, so this is causing issues for
`brew audit`.
This updates the condition in `Cask::Auditor` to check for a non-empty
hash instead, which resolves the issue.
c0f23acdcd