safe use of rescue nil

rescue_nil.rb

def chunky_peanut_butter
  EndlessChunkyPBSupplier.grab(:chunky_pb)
end

def smooth_peanut_butter
  Cabinet.fetch(:smooth_peanut_butter) rescue nil
end

def make_pb_and_j
  pb = smooth_peanut_butter || chunky_peanut_butter
  ...
end

def make_peanut_butter_fudge
  pb = smooth_peanut_butter || raise "Only smooth peanut butter will do"
  ...
end