Fix getCollection when collection is empty

[TheOtterlord]

Changes

Fixes getCollection when the collection is empty. 3.1.2 included #8382 which was meant to prevent an error from throwing, and replace it with a warning. The implementation instead returned an Astro integration from getCollection. This PR removes that, and replaces it with a console.warn before returning an empty array.

Other options

• We could revert the PR entirely,.
• We can return undefined if we want to explicitely show the collection does not exist.

Testing

The previous PR had testing to confirm it was no longer throwing an error.

Docs

I need to check if docs need updating, but in any case the current behaviour is already undocumented. @Princesseuh did mention that the previous PR deprecated an error, so that will likely also need addressing.

/cc @withastro/maintainers-docs for feedback!

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[TheOtterlord]

Haha, looks like I missed #8640
Closing as duplicate!