[BUG] Using the --static option causes Exception in... | saltstack/salt

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Description
Using the --static option causes Exception in cmd_iter_no_block

Setup
Salt master running 3003 -> salt syndic running 3003 -> salt minion running 3003

Steps to Reproduce the behavior
root@salt-master:~ # salt server123 test.ping
server123:
True

root@salt-master:~ # salt --static server123 test.ping
Exception ignored in: <generator object LocalClient.cmd_iter_no_block at 0x7f6e4cd9e9e8>
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/salt/client/init.py", line 939, in cmd_iter_no_block
self.event.close_pub()
AttributeError: 'NoneType' object has no attribute 'close_pub'
server123:
True

Expected behavior
--static option does not raise exception

Screenshots
If applicable, add screenshots to help explain your problem.

Versions Report

salt --versions-report

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

root@salt-master:~ # salt --versions-report
Salt Version:
          Salt: 3003

Dependency Versions:
          cffi: Not Installed
      cherrypy: unknown
      dateutil: 2.6.1
     docker-py: Not Installed
         gitdb: 2.0.3
     gitpython: 2.1.8
        Jinja2: 2.10
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 0.5.6
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: Not Installed
  pycryptodome: 3.4.7
        pygit2: Not Installed
        Python: 3.6.9 (default, Apr 18 2020, 01:56:04)
  python-gnupg: 0.4.1
        PyYAML: 3.12
         PyZMQ: 17.1.2
         smmap: 2.0.3
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.2.5

System Versions:
          dist: ubuntu 18.04 Bionic Beaver
        locale: UTF-8
       machine: x86_64
       release: 4.15.0-99-generic
        system: Linux
       version: Ubuntu 18.04 Bionic Beaver

# salt minion package version
server123:
    Desired=Unknown/Install/Remove/Purge/Hold
    | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
    |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
    ||/ Name           Version      Architecture Description
    +++-==============-============-============-================================================================
    ii  salt-minion    3003+ds-1    all          client package for salt, the distributed remote execution system

Additional context
Add any other context about the problem here.

Start in salt/client/init.py at cmd_iter_no_block, then reproduce the reported salt --static server123 test.ping command in the documented master, syndic, and minion setup. Trace the cleanup around self.event.close_pub and verify that the command still returns the minion result without raising an exception.

Written by the indexing model from the issue text.

[BUG] Using the --static option causes Exception in cmd_iter_no_block

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