Unprotected crash/panic when REST endpoint responds with 401

[heythisisnate]

Crashes on this line when the HTTP call on the lines above result in a 401 Unauthorized response:

konnected-security/src/lfs/rest_endpoint.lua

Line 57 in a9a4ab4

gpio.mode(pin, gpio.OUTPUT)

bad argument #1 to 'mode' (number expected, got nil)
stack traceback:
	[C]: in function 'mode'
	...ecurity/konnected-security/src/lfs/rest_endpoint.lua: in function <...ecurity/konnected-security/src/lfs/rest_endpoint.lua:38>

Local variable pin should be initialized by actuator.pin in the case when the initial HTTP GET for status fails. Manifested by this HomeBridge issue: konnected-io/homebridge-konnected#8