Remove unused import

weblate/accounts/models.py

@@ -18,7 +18,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-from django.db import models, IntegrityError
+from django.db import models
 from django.dispatch import receiver
 from django.conf import settings
 from django.contrib.auth.signals import user_logged_in