BUGFIX: Remove empty check on target collection in resource:copy
BUGFIX: Remove empty check on target collection in resource:copy

Hotfix: targetCollection->getObjects() always return false

`$targetCollection->getObjects()` method returns a generator, which will always return `false`
This makes it impossible to use `resource:copy` as this always fails with a `The target collection "tmpNewCollection" is not empty.` error.

The problem is mentioned here: #2510
neos/flow,neos/flow,neos/flow,neos/flow