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BeEmpty() materializes IEnumerable<T> only once, even on failure (#2530)

* BeEmpty() materializes IEnumerable<T> only once, even on failure

- Make BeEmpty() materialize only the first item, as no further processing is needed for validation
- The error message now mentions "but found at least 1 item" and outputs the said item

* Tweak error message & fix tests

* Make similar changes for BeNullOrEmpty

* Add test, as per request

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