Exception thrown when creating a power feed with a rack located on a different site than the power panel.

[kkthxbye-code]

NetBox version

v3.6.6

Python version

3.11

Steps to Reproduce

I'll do very light replication steps here as the error is very obvious in the code (missing variable), hope that's okay.

1. Create power feed
2. Choose power panel on site x
3. Choose rack on site y
4. Save

Expected Behavior

No exception

Observed Behavior

<class 'KeyError'>

'site'

netbox/netbox/dcim/models/power.py

Lines 175 to 184 in d10ac9b

	# Rack must belong to same Site as PowerPanel
	if self.rack and self.rack.site != self.power_panel.site:
	raise ValidationError(_(
	"Rack {rack} ({site}) and power panel {powerpanel} ({powerpanel_site}) are in different sites"
	).format(
	rack=self.rack,
	rack_site=self.rack.site,
	powerpanel=self.power_panel,
	powerpanel_site=self.power_panel.site
	))

{site} is present in the format string, but not in the format arguments (called rack_site instead).