refactor: prevent using `empty()` on `CURLRequest` #12562

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.3) / Sanity Tests	2m 36s
Others (8.2) / Sanity Tests	2m 52s
Others (8.1) / Sanity Tests	2m 34s
DatabaseLive	0s
SeparateProcess	0s
CacheLive	0s
Upload coverage results to Coveralls	0s
	8m 3s

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