trivial: remove unused imports

combo/apps/maps/models.py

@@ -20,9 +20,7 @@ from django.utils.text import slugify
 from django.utils.translation import ugettext_lazy as _
 from django.core.urlresolvers import reverse_lazy
 from django import forms
-from django import template
 from django.conf import settings
-from django.core.exceptions import PermissionDenied
 
 from combo.data.models import CellBase
 from combo.data.library import register_cell_class