Don't throw an exception when the graphite server is unreachable

from django.http import StreamingHttpResponse, HttpResponseServerError

from django.shortcuts import get_object_or_404

from django.views.generic.detail import DetailView

from django.shortcuts import get_object_or_404

from django.views.generic.edit import UpdateView

from django.conf import settings

from django.contrib.messages.views import SuccessMessageMixin