Wrong number of parameters for an error formatter for an undefined formatter

[dblock]

error_formatter/base yields a broken block (missing env parameter) as a formatter for an unknown format

"wrong number of arguments (4 for 3)"                                                                                           | ETA:  --:--:--
/home/dblock/.rvm/gems/ruby-1.9.3-p194-perf/gems/grape-.2.3/lib/grape/error_formatter/base.rb:21:in `block in formatter_for'
/home/dblock/.rvm/gems/ruby-1.9.3-p194-perf/gems/grape-0.2.3/lib/grape/middleware/error.rb:66:in `call'"

[dblock]

Monkey patch to fix:

module Grape
  module ErrorFormatter
    module Base
      class << self
        def formatter_for(api_format, options = {})
          spec = formatters(options)[api_format]
          case spec
          when nil
            Grape::ErrorFormatter::Txt
          when Symbol
            method(spec)
          else
            spec
          end
        end
      end
    end
  end
end