fix some issues found by pycharm

nsupdate/main/views.py

@@ -280,7 +280,7 @@ class DeleteHostView(DeleteView):
 
     def get_object(self, *args, **kwargs):
         obj = super(DeleteHostView, self).get_object(*args, **kwargs)
-        if (obj.created_by != self.request.user or obj.abuse_blocked):
+        if obj.created_by != self.request.user or obj.abuse_blocked:
             # disallow deletion if abuse_blocked is set, otherwise the
             # abuser can just delete and recreate the host
             raise PermissionDenied()  # or Http404

nsupdate/urls.py

@@ -7,9 +7,6 @@ from django.conf.urls import patterns, include, url
 from django.contrib import admin
 from django.contrib.auth import views as auth_views
 
-from registration.backends.default.views import RegistrationView
-from registration.forms import RegistrationForm
-
 
 def remember_me_login(request, *args, **kw):
     """