Bug 1835484

Description of problem:
I try to run:

podman-compose up -d

FILE BELOW add comment to port: 80:80.
---
# wordPress with mariaDB

version: '2'

services:

  wordpress:
    image: wordpress:5.4.1
    ports:
      #  - 80:80
    links:
      - wp-mariadb:db
    depends_on:
      - wp-mariadb
    volumes:
      - wordpress:/var/www/html/

  wo-mariadb:
    image: mariadb:10.1.45
    environment:
      # env-vars TODO
      MYSQL_ROOT_PASSOWRD: titok
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: 12345678
    volumes:
      - db:/var/lib/mysql

volumes:
  wordpress:
  db:

Version-Release number of selected component:
podman-compose-0.1.5-3.git20191107.fc32

Additional info:
reporter:       libreport-2.12.0
cgroup:         0::/user.slice/user-1000.slice/user/dbus\x2d:1.2\x2dcom.gexperts.Tilix.slice/vte-spawn-09f3a5e7-0f31-4f48-8704-824aecfb0249.scope
cmdline:        /usr/bin/python3 /usr/bin/podman-compose up -d
crash_function: container_to_args
exception_type: TypeError
executable:     /usr/bin/podman-compose
interpreter:    python3-3.8.2-2.fc32.x86_64
kernel:         5.6.8-300.fc32.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
podman_compose.py:489:container_to_args:TypeError: 'NoneType' object is not iterable

Traceback (most recent call last):
  File "/usr/bin/podman-compose", line 11, in <module>
    load_entry_point('podman-compose==0.1.6.dev0', 'console_scripts', 'podman-compose')()
  File "/usr/lib/python3.8/site-packages/podman_compose.py", line 1267, in main
    podman_compose.run()
  File "/usr/lib/python3.8/site-packages/podman_compose.py", line 755, in run
    cmd(self, args)
  File "/usr/lib/python3.8/site-packages/podman_compose.py", line 939, in wrapped
    return func(*args, **kw)
  File "/usr/lib/python3.8/site-packages/podman_compose.py", line 1059, in compose_up
    podman_args = container_to_args(compose, cnt,
  File "/usr/lib/python3.8/site-packages/podman_compose.py", line 489, in container_to_args
    for i in cnt.get('ports', []):
TypeError: 'NoneType' object is not iterable

Local variables in innermost frame:
compose: <podman_compose.PodmanCompose object at 0x7f4dc1d120d0>
cnt: {'name': '011-2020-05-13-podman-compose_wordpress_1', 'num': 1, 'service_name': 'wordpress', 'image': 'wordpress:5.4.1', 'ports': None, 'links': ['wp-mariadb:db'], 'depends_on': ['wp-mariadb'], 'volumes': ['wordpress:/var/www/html/'], '_deps': {'wp-mariadb'}, 'labels': ['io.podman.compose.config-hash=123', 'io.podman.compose.project=011-2020-05-13-podman-compose', 'io.podman.compose.version=0.0.1', 'com.docker.compose.container-number=1', 'com.docker.compose.service=wordpress'], '_service': 'wordpress', '_project': '011-2020-05-13-podman-compose', 'pod': '011-2020-05-13-podman-compose', 'extra_hosts': ['wordpress:127.0.0.1', '011-2020-05-13-podman-compose_wordpress_1:127.0.0.1', 'wo-mariadb:127.0.0.1', '011-2020-05-13-podman-compose_wo-mariadb_1:127.0.0.1', 'db:127.0.0.1']}
detached: True
podman_command: 'run'
dirname: '/home/mars/Develope/000-DATED/011-2020-05-13-podman-compose'
shared_vols: {'wordpress', 'db'}
pod: '011-2020-05-13-podman-compose'
podman_args: ['run', '--name=011-2020-05-13-podman-compose_wordpress_1', '-d', '--pod=011-2020-05-13-podman-compose', '--label', 'io.podman.compose.config-hash=123', '--label', 'io.podman.compose.project=011-2020-05-13-podman-compose', '--label', 'io.podman.compose.version=0.0.1', '--label', 'com.docker.compose.container-number=1', '--label', 'com.docker.compose.service=wordpress', '--mount', 'type=bind,source=/home/mars/.local/share/containers/storage/volumes/011-2020-05-13-podman-compose_wordpress/_data,destination=/var/www/html/,bind-propagation=z', '--add-host', 'wordpress:127.0.0.1', '--add-host', '011-2020-05-13-podman-compose_wordpress_1:127.0.0.1', '--add-host', 'wo-mariadb:127.0.0.1', '--add-host', '011-2020-05-13-podman-compose_wo-mariadb_1:127.0.0.1', '--add-host', 'db:127.0.0.1']
sec: []
i: 'db:127.0.0.1'
net: None
env: []
tmpfs_ls: []
volume: 'wordpress:/var/www/html/'
mount_args: 'type=bind,source=/home/mars/.local/share/containers/storage/volumes/011-2020-05-13-podman-compose_wordpress/_data,destination=/var/www/html/,bind-propagation=z'