Serializing array without root with format_key raise exception

[donbobka]

Following code raises exception undefined method camelize' for false:FalseClass`

class WebLogController < ActionController::Base
  def render_array_without_root
    render json: [WebLog.new({name: 'Name 1', display_name: 'Display Name 1'}), 
                  WebLog.new({name: 'Name 2', display_name: 'Display Name 2'})], 
           root: false, 
           each_serializer: WebLogLowerCamelSerializer
  end
end

[donbobka]

My PR #591

[arthurnn]

closing this as PR was merged in.