Fix race condition in useUpdate.ts

[KDederichs]

Fixes #8684 by defaulting coll to [] if it's undefined.

Now before you ask me to write a test for this:
I don't know how :D

I'm not proficient enough in jest testing to do this since it seems to be related to a race condition in which react query doesn't set the initial cache entry before you try to update it, so I have no idea how to test against that.

[KDederichs]

For a bit more context I think what's happening is this:

The resource I'm updating is the same I'm fetching in the Reference AutoComplete input since it's referencing another instance of the same resource.

So it's executing a getMany right after/before the update so you they run at the same time. The update seems to finish before the fetch is done so when it's calling that there's no data there yet so it seems to result in an undefined coll

[slax57]

Superseded by #8719