      # TODO: document EMPTY workaround
      media_type = 'application/x-www-form-urlencoded'
  
      def parse(self, input):
          request = self.resource.request
  
          if request.method == 'PUT':
              data = parse_qs(input)
 
</s> remove 
        if request.method == 'POST':
 </s> add         elif request.method == 'POST': </s> remove             return None
 </s> add             return None # TODO : Breaks, because determine_content should return a tuple.
    EMPTY_VALUE = 'EMPTY'

      # TODO: document EMPTY workaround
      media_type = 'application/x-www-form-urlencoded'
  
    EMPTY_VALUE = 'EMPTY'

      def parse(self, input):
          request = self.resource.request
  
          if request.method == 'PUT':
              data = parse_qs(input)
keep keep add keep keep keep keep keep
 FomrParser now implements a work around for empty values in a list 
djangorestframework/parsers.py