Fix Hue color state for missing xy

[amelchio]

Description:

I made a mistake with my revert in #14154, I missed that the original code used get() to handle non-existent keys. Sorry 😢.

Related issue (if applicable): reported in #14113 (comment)

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[balloob]

haha I was just looking at the other PR and I was, wait a second, my comment about the issue got removed and we no longer guard against it .

[amelchio]

To be fair, your comment was about the hue and sat keys not always being present and that is indeed no longer an issue. I just missed that the same thing applies to xy :-/

I really hope it's back to working now, debugging without having the hardware is difficult 😅