refactor: prevent using `empty()` on `CURLRequest` #12298

Job	Run time
Setup PHP Version for Code Coverage	1s
Others (8.1) / Sanity Tests	2m 26s
Others (8.2) / Sanity Tests	3m 23s
Others (8.3) / Sanity Tests	2m 14s
SeparateProcess (8.1) / tests	3m 7s
SeparateProcess (8.2) / tests	3m 27s
SeparateProcess (8.3) / tests	3m 10s
CacheLive (8.3) / Cache Live Tests	2m 5s
CacheLive (8.1) / Cache Live Tests	2m 8s
CacheLive (8.2) / Cache Live Tests	2m 8s
DatabaseLive (8.1, MySQLi, 8.0) / tests	4m 54s
DatabaseLive (8.1, OCI8, 8.0) / tests	5m 53s
DatabaseLive (8.1, MySQLi, 5.7) / tests	3m 6s
DatabaseLive (8.1, Postgre, 8.0) / tests	2m 34s
DatabaseLive (8.1, SQLite3, 8.0) / tests	2m 9s
DatabaseLive (8.1, SQLSRV, 8.0) / tests	4m 50s
DatabaseLive (8.2, MySQLi, 8.0) / tests	4m 28s
DatabaseLive (8.2, OCI8, 8.0) / tests	6m 16s
DatabaseLive (8.2, Postgre, 8.0) / tests	3m 4s
DatabaseLive (8.2, SQLite3, 8.0) / tests	3m 3s
DatabaseLive (8.2, SQLSRV, 8.0) / tests	4m 50s
DatabaseLive (8.3, MySQLi, 8.0) / tests	3m 41s
DatabaseLive (8.3, OCI8, 8.0) / tests	5m 46s
DatabaseLive (8.3, Postgre, 8.0) / tests	2m 33s
DatabaseLive (8.3, SQLite3, 8.0) / tests	2m 23s
DatabaseLive (8.3, SQLSRV, 8.0) / tests	4m 5s
Upload coverage results to Coveralls / coveralls	43s
	1h 28m 27s

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