views: wraps generic writing views with atomic() (#32533)

To prevent uninitialized connector instances to remain when errors occur
during Model.save() notably in the csvdatasource application.

passerelle/views.py

@@ -25,6 +25,7 @@ from django.core.cache import cache
 from django.core.exceptions import PermissionDenied
 from django.contrib.auth import logout as auth_logout
 from django.contrib.auth import views as auth_views
+from django.db import transaction
 from django.http import HttpResponse, HttpResponseRedirect, Http404
 from django.views.decorators.csrf import csrf_exempt
 from django.views.generic import (
@@ -180,7 +181,8 @@ class GenericCreateConnectorView(GenericConnectorMixin, CreateView):
     template_name = 'passerelle/manage/service_form.html'
 
     def form_valid(self, form):
-        response = super(GenericCreateConnectorView, self).form_valid(form)
+        with transaction.atomic():
+            response = super(GenericCreateConnectorView, self).form_valid(form)
         self.object.availability()
         return response
 
@@ -189,7 +191,8 @@ class GenericEditConnectorView(GenericConnectorMixin, UpdateView):
     template_name = 'passerelle/manage/service_form.html'
 
     def form_valid(self, form):
-        response = super(GenericEditConnectorView, self).form_valid(form)
+        with transaction.atomic():
+            response = super(GenericEditConnectorView, self).form_valid(form)
         self.object.availability()
         return response