Deleted HASS lights in scenes/rooms crashes

[alexyao2015]

Describe the bug

Steps to Reproduce

1. add light to room/scene
2. delete light from hass
3. try to use the emulator
4. observe none type errors

Expected behavior

automatically remove non existing lights from config (rooms/scenes/groups/etc)

Logs

Hardware Info:

• Architecture (Ex: x86, ARM):
• Addon version (Ex: stable or dev):
  • Value of "tag_commit_or_branch" if using dev:
• OS (Ex: Windows 10, Ubuntu Buster):
• Hardware (Ex: PC, Raspberry Pi 1/2/3/Zero):

Additional context