Salt-ssh KeyError: u'sys.doc'

Description of Issue

Setup

(Please provide relevant configs and/or SLS files (Be sure to remove sensitive info).)

Steps to Reproduce Issue

(Include debug logs if possible and relevant.)

salt-ssh 'dqd-e-k8s-node12' test.ping

dqd-e-k8s-node12:
----------
retcode:
1
stderr:
Traceback (most recent call last):
File "/var/tmp/.root_ffb144_salt/salt-call", line 27, in
salt_call()
File "/var/tmp/.root_ffb144_salt/pyall/salt/scripts.py", line 431, in salt_call
client.run()
File "/var/tmp/.root_ffb144_salt/pyall/salt/cli/call.py", line 57, in run
caller.run()
File "/var/tmp/.root_ffb144_salt/pyall/salt/cli/caller.py", line 138, in run
ret = self.call()
File "/var/tmp/.root_ffb144_salt/pyall/salt/cli/caller.py", line 175, in call
docs = self.minion.functions'sys.doc'
File "/var/tmp/.root_ffb144_salt/pyall/salt/loader.py", line 1196, in getitem
func = super(LazyLoader, self).getitem(item)
File "/var/tmp/.root_ffb144_salt/pyall/salt/utils/lazy.py", line 108, in getitem
raise KeyError(key)
KeyError: u'sys.doc'
stdout:

Versions Report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)
Salt Version:
Salt: 2019.2.0

Dependency Versions:
cffi: 1.11.5
cherrypy: Not Installed
dateutil: Not Installed
docker-py: Not Installed
gitdb: Not Installed
gitpython: Not Installed
ioflo: Not Installed
Jinja2: 2.7.2
libgit2: Not Installed
libnacl: Not Installed
M2Crypto: 0.21.1
Mako: Not Installed
msgpack-pure: Not Installed
msgpack-python: 0.4.8
mysql-python: 1.2.5
pycparser: 2.18
pycrypto: 3.8.2
pycryptodome: Not Installed
pygit2: Not Installed
Python: 2.7.5 (default, Nov 6 2016, 00:28:07)
python-gnupg: Not Installed
PyYAML: 3.10
PyZMQ: 14.3.1
RAET: Not Installed
smmap: Not Installed
timelib: Not Installed
Tornado: 4.2.1
ZMQ: 3.2.5

System Versions:
dist: centos 7.2.1511 Core
locale: UTF-8
machine: x86_64
release: 3.10.0-327.22.2.el7.x86_64
system: Linux
version: CentOS Linux 7.2.1511 Core

Start with the reported salt-ssh test.ping reproduction and trace the failure through salt/cli/caller.py, where sys.doc is requested, into salt/loader.py and salt/utils/lazy.py. Confirm why the sys.doc lookup raises KeyError and verify that the same command completes without the reported traceback.