core: ONVIF AttributeError: 'NoneType' object has no attribute 'WSPullPointSupport'

The problem

Since 0.110.0 my ONVIF cameras stopped working (Cheap AliExpress outdoor cameras). I got this error:

  File "/usr/src/homeassistant/homeassistant/components/onvif/device.py", line 234, in async_get_capabilities
    pullpoint = event_capabilities.WSPullPointSupport
AttributeError: 'NoneType' object has no attribute 'WSPullPointSupport'

I guess the event_capabilities is None in my case, then it raises the AttributeError. Probably fixed by adding an if check to see if event_capabilities is not None.

Environment

• Home Assistant Core release with the issue: 0.110.0
• Last working Home Assistant Core release (if known): 0.109.7
• Operating environment (Home Assistant/Supervised/Docker/venv): Docker
• Integration causing this issue: ONVIF
• Link to integration documentation on our website: https://www.home-assistant.io/integrations/onvif/

Problem-relevant configuration.yaml

The folowing config was working flawlessly:

- platform: onvif
  name: Frontyard
  host: 192.168.0.113
  port: 8899
  username: xxxxx
  password: xxxxx
  profile: 1
  extra_arguments: "-q:v 8"  

With the new integration, i got a message to remove this config. I removed it, but no image stream pops up.

Traceback/Error logs

2020-05-20 15:18:49 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry Frontyard - 00:12:17:1b:4b:89 for onvif
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 217, in async_setup
    hass, self
  File "/usr/src/homeassistant/homeassistant/components/onvif/__init__.py", line 73, in async_setup_entry
    if not await device.async_setup():
  File "/usr/src/homeassistant/homeassistant/components/onvif/device.py", line 99, in async_setup
    self.capabilities = await self.async_get_capabilities()
  File "/usr/src/homeassistant/homeassistant/components/onvif/device.py", line 234, in async_get_capabilities
    pullpoint = event_capabilities.WSPullPointSupport
AttributeError: 'NoneType' object has no attribute 'WSPullPointSupport'

Additional information