"Select all" toggle missing from power outlets list

[jeremystretch]

Issue type

[ ] Feature request
[x] Bug report
[ ] Documentation

Environment

• Python version: 3.5.2
• NetBox version: 2.2.7

Description

If a PDU device has no console ports defined, the "select all" checkbox will not be displayed at the top of the power outlets list. This is due to an error in the device.html template:

{% if perms.dcim.change_poweroutlet and cs_ports|length > 1 %}

should be

{% if perms.dcim.change_poweroutlet and power_outlets|length > 1 %}