White background (instead of the theme one) when no animated_backround is configured

[SeLLeRoNe]

Your Animated Background configuration

I only have this in ui-lovelace.yaml , not in the additional dashboards (management and test ones)

animated_background:
  default_url: /local/animated_backgrounds/sunny.html
  included_users:
    - Andrea Iannucci
  included_devices:
    - windows
  entity: "weather.dark_sky"
  state_url:
    'sunny': /local/animated_backgrounds/sunny.html
    'partlycloudy': /local/animated_backgrounds/cloudy.html
    'cloudy': /local/animated_backgrounds/cloudy.html
    'mostlycloudy': /local/animated_backgrounds/mostlycloudy.html
    'clear-night': /local/animated_backgrounds/night.html
    'fog': /local/animated_backgrounds/fog.html

Version of Home Assistant
"Latest" is not a version number. Please provide the actual version number.
1.109.2

Describe the bug
A clear and concise description of what the bug is.
All the dashboards are loading a white background instead of the theme background presumably because the animated background is not configured for those dashboards.

Browser console log
Post anything related to animated-background.js
Not apparent/clear related error in the dashboard

To Reproduce
Steps to reproduce the behavior:

1. Create a new dashboard
2. Don't configure any animated_background
3. View the dashboard

Expected behavior
A clear and concise description of what you expected to happen.
Use the default theme background if no configuration is present.

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Version: 81.0.4044.129

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Screenshots
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Additional context
Add any other context about the problem here.

[SeLLeRoNe]

It might actually be the same issue of #17

[Villhellm]

Trying to add logic for multiple dashboard functionality is what screwed everything up, but I think I've mostly figured out the proper logic now. Give the latest update a shot.

[SeLLeRoNe]

Worked perfectly! :)