class RuboCop::Cop::Rails::Blank

def on_if(node)
  return unless cop_config['UnlessPresent']
  return unless node.unless?
  return if node.else? && config.cop_enabled?('Style/UnlessElse')
  unless_present?(node) do |method_call, receiver|
    range = unless_condition(node, method_call)
    message = format(MSG_UNLESS_PRESENT, prefer: replacement(receiver), current: range.source)
    add_offense(range, message: message) do |corrector|
      autocorrect(corrector, node)
    end
  end
end