Incorrect error message for render issue

Description of Issue/Question

When using '- names' of cmd.run in a state, if there is a trailing colon on the end of a command with nothing defined underneath, Salt errors out that invalid arguments were passed to state.apply rather than throwing a render error, or some other more descriptive error.

I guess it's not technically invalid SLS, but this makes troubleshooting the error really confusing because the state does render when using state.show_sls, but state.apply fails as if I am not running it correctly.

Setup

test.sls

"Test Breakage":
  cmd.run:
    - names:
      - 'echo "something"':

Steps to Reproduce Issue

[root@saltmaster salt]# salt-call state.apply test

Passed invalid arguments: 'NoneType' object is not iterable.

Usage:

    .. versionadded:: 2015.5.0

    This function will call :mod:`state.highstate
    <salt.modules.state.highstate>` or :mod:`state.sls
    <salt.modules.state.sls>` based on the arguments passed to this function.
    It exists as a more intuitive way of applying states.

   ... the rest of the help output

Versions Report

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

My minions and master are all using 2018.3.2.

Salt Version:
Salt: 2018.3.2

Dependency Versions:
cffi: 1.6.0
cherrypy: Not Installed
dateutil: 2.7.3
docker-py: 3.5.0
gitdb: Not Installed
gitpython: Not Installed
ioflo: Not Installed
Jinja2: 2.7.2
libgit2: 0.26.3
libnacl: Not Installed
M2Crypto: 0.28.2
Mako: Not Installed
msgpack-pure: Not Installed
msgpack-python: 0.5.6
mysql-python: Not Installed
pycparser: 2.14
pycrypto: 2.6.1
pycryptodome: Not Installed
pygit2: 0.26.4
Python: 2.7.5 (default, Sep 12 2018, 05:31:16)
python-gnupg: Not Installed
PyYAML: 3.11
PyZMQ: 15.3.0
RAET: Not Installed
smmap: Not Installed
timelib: Not Installed
Tornado: 4.2.1
ZMQ: 4.1.4

System Versions:
dist: redhat 7.6 Maipo
locale: UTF-8
machine: x86_64
release: 3.10.0-957.el7.x86_64
system: Linux
version: Red Hat Enterprise Linux Server 7.6 Maipo

Start by reproducing the issue with the provided test.sls and compare state.show_sls with state.apply. Trace the rendering and argument-validation path for the cmd.run state; done means the trailing-colon case reports a descriptive render error instead of invalid arguments to state.apply.