[plotters][serializers] Fix error thrown from latest version of DRF

beat/web/plotters/serializers.py

@@ -101,6 +101,7 @@ class FullPlotterSerializer(PlotterAllSerializer):
 
     class Meta(PlotterAllSerializer.Meta):
         default_fields = PlotterAllSerializer.Meta.default_fields + PlotterAllSerializer.Meta.extra_fields
+        exclude = []
 
 
 #----------------------------------------------------------
@@ -117,7 +118,7 @@ class PlotterParameterCreationSerializer(ContributionCreationSerializer):
 
     def create(self, validated_data):
         plotterparameter = None
-        
+
         if not validated_data.has_key("name"):
             raise serializers.ValidationError('No name provided')
 
@@ -131,7 +132,7 @@ class PlotterParameterCreationSerializer(ContributionCreationSerializer):
 
         if not self.data.has_key("plotter"):
             raise serializers.ValidationError('No plotter provided')
-        
+
         plotter = None
         try:
             plotter = Plotter.objects.get(id=self.data['plotter'])