PEP fix

InvenTree/company/models.py

@@ -9,7 +9,7 @@ import os
 
 from django.utils.translation import ugettext_lazy as _
 from django.core.validators import MinValueValidator
-from django.core.exceptions import ValidationError, PermissionDenied
+from django.core.exceptions import ValidationError
 
 from django.db import models
 from django.db.models import Sum, Q, UniqueConstraint