style: Fix majority of Prospector complaints

Mainly whitespace fixes

activities/views.py

@@ -7,8 +7,8 @@ from django.http import HttpResponse
 from django.views.generic import DetailView, ListView, View
 from django.views.generic.detail import SingleObjectMixin
 
-from . import models
 from people import models as people_models
+from . import models
 
 
 class ActivitySeriesListView(ListView):
@@ -35,41 +35,43 @@ class ActivityListView(ListView):
     """
     model = models.Activity
     template_name = 'activities/activity/list.html'
-    
-    
+
+
 class ActivityDetailView(DetailView):
     """
     View displaying details of a single :class:`Activity`.
     """
     model = models.Activity
     template_name = 'activities/activity/detail.html'
-    
+
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
-        
-        context['user_is_attending'] = self.object.attendance_list.filter(pk=self.request.user.person.pk).exists()
-        
+
+        context['user_is_attending'] = self.object.attendance_list.filter(
+            pk=self.request.user.person.pk
+        ).exists()
+
         return context
-    
+
 
 class ActivityAttendanceView(SingleObjectMixin, View):
     """
     View to add or delete attendance of an activity.
     """
     model = models.Activity
-    
+
     def post(self, request, *args, **kwargs):
         self.object = self.get_object()
 
         if request.is_ajax():
             data = json.loads(request.body)
-            
+
             person = people_models.Person.objects.get(pk=data['pk'])
             self.object.attendance_list.add(person)
 
             return HttpResponse(status=204)
 
-        pass
+        return HttpResponse("URL does not support non-AJAX requests", status=400)
 
     def delete(self, request, *args, **kwargs):
         self.object = self.get_object()
@@ -82,5 +84,4 @@ class ActivityAttendanceView(SingleObjectMixin, View):
 
             return HttpResponse(status=204)
 
-        pass
-
+        return HttpResponse("URL does not support non-AJAX requests", status=400)