Ignore watcher update if pond isn't initialised

[roguesherlock]

There's this weird issue in vue 3 where the watcher fires before the element is even mounted; which causes the watcher callback to fail.

I've updated the watcher to ignore updates if the pond wasn't initialised. let me know what you guys think!

[rikschennink]

Thanks, I'll look into this when I have some time

[dallinbjohnson]

I am waiting for this to be merged. I am having the same problem.