          request = self.resource.request
  
          if request.method == 'PUT':
              data = parse_qs(input)
  
          if request.method == 'POST':
              # Django has already done the form parsing for us.
              data = request.POST
  
          data = self.flatten_data(data)
  
 
</s> remove             return None
 </s> add             return None # TODO : Breaks, because determine_content should return a tuple.
        elif request.method == 'POST':
          request = self.resource.request
  
          if request.method == 'PUT':
              data = parse_qs(input)
        elif request.method == 'POST':
        elif request.method == 'POST':
              # Django has already done the form parsing for us.
              data = request.POST
  
          data = self.flatten_data(data)
  
keep keep keep keep replace replace keep keep keep keep keep
 FomrParser now implements a work around for empty values in a list 
djangorestframework/parsers.py