Merge branch 'develop' into feature

netbox/dcim/models/device_components.py

@@ -4,7 +4,7 @@ from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelatio
 from django.core.exceptions import ValidationError
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models
-from django.db.models import F, Sum
+from django.db.models import Sum
 from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
 from mptt.models import MPTTModel, TreeForeignKey
@@ -22,7 +22,6 @@ from utilities.tracking import TrackingModelMixin
 from wireless.choices import *
 from wireless.utils import get_channel_attr
 
-
 __all__ = (
     'BaseInterface',
     'CabledObjectModel',