IntegrityError when creating rack group or power panel without site

[hSaria]

Environment

• Python version: 3.6.9
• NetBox version: 2.7.6

Steps to Reproduce

1. Go to rack group create form (/dcim/rack-groups/add/)
2. Enter name and slug, but leave site empty
3. Submit

Expected Behavior

The form shouldn't allow me to submit without selecting a site.

Observed Behavior

Exception

<class 'django.db.utils.IntegrityError'>

null value in column "site_id" violates not-null constraint
DETAIL:  Failing row contains (6, Rack Group 1, rg1, null, 2020-02-10, 2020-02-10 13:27:20.503952+00).

[hSaria]

Caused by #3912. Just needs:

diff --git a/netbox/dcim/forms.py b/netbox/dcim/forms.py
index 4c8a0821..e013b0fd 100644
--- a/netbox/dcim/forms.py
+++ b/netbox/dcim/forms.py
@@ -385,7 +385,6 @@ class SiteFilterForm(BootstrapMixin, TenancyFilterForm, CustomFieldFilterForm):
 class RackGroupForm(BootstrapMixin, forms.ModelForm):
     site = DynamicModelChoiceField(
         queryset=Site.objects.all(),
-        required=False,
         widget=APISelect(
             api_url="/api/dcim/sites/"
         )