[BUG] State user.present use shell for unless condition

Description
If you want to create user.present, with - shell: /bin/false it gets used for unless command run and by that it gets ignored.

By default mysql create user in debian like:
mysql:x:119:128:MySQL Server,,,:/nonexistent:/bin/false

We create that before instalation, because we want to do some preseed operations, with owner setup. This worked without problem on version 3000.2. I was doing upgrades because of CVE to 3002.

Setup

mysql_user:
  user.present:
    - name: mysql
    - system: True
    - home: /nonexistent
    - createhome: False
    - shell: /bin/false
    - fullname: MySQL Server
    - unless: /bin/grep -i mysql /etc/passwd

Steps to Reproduce the behavior
Use sls above and for diffrent runs try to change - home, by the unless user should not be changes becase he exists.

[WARNING ] Attempt to run a shell command with what may be an invalid shell! Check to ensure that the shell </bin/false> is valid for this user.
[INFO    ] Executing command '/bin/grep -i mysql /etc/passwd' in directory '/home/XXXXX'
[INFO    ] Executing command ['usermod', '-d', '/nonexistent', 'mysql'] in directory '/home/XXXXX'

if you comment shell setting or use shell like bash, unless works.

Expected behavior
Shell should not be change by setting user shell at least this should be 2 diffrent options.

Versions Report

Salt Version:
          Salt: 3002.2

Dependency Versions:
          cffi: Not Installed
      cherrypy: Not Installed
      dateutil: 2.7.3
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        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: 2.6.1
  pycryptodome: 3.6.1
        pygit2: Not Installed
        Python: 3.7.3 (default, Dec 20 2019, 18:57:59)
  python-gnupg: Not Installed
        PyYAML: 3.13
         PyZMQ: 17.1.2
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.1

System Versions:
          dist: debian 10 buster
        locale: UTF-8
       machine: x86_64
       release: 4.19.0-10-amd64
        system: Linux
       version: Debian GNU/Linux 10 buster

Additional context
Tried to find this in other issues, but cannot find one. If this is duplicity i apologize.