Remove unused imports

Author: rowanseymour

smartmin/views.py

@@ -1,4 +1,3 @@
-import json
 import operator
 from functools import reduce
 from urllib.parse import quote as urlquote
@@ -19,7 +18,6 @@
 from django.views.generic.base import TemplateView
 from django.views.generic.edit import CreateView, FormView, ModelFormMixin, ProcessFormView, UpdateView
 
-from smartmin.mixins import NonAtomicMixin
 
 from . import widgets