FIX Empty relations don't have extra DB calls with eager-loading #1407

Job	Run time
CI / Context	1s
CI / Generate matrix	11s
CI / 8.1 prf-low mysql57 phpunit framework	17m 35s
CI / 8.1 mysql57 phpunit framework	16m 55s
CI / 8.2 mysql80 phpunit framework	24m 7s
CI / 8.1 prf-low mysql57 phpunit cms	1m 25s
CI / 8.1 mysql57 phpunit cms	1m 24s
CI / 8.2 mysql80 phpunit cms	2m 12s
CI / 8.1 mysql57 phplinting	1m 40s
CI / Check unreleased changes	0s
CI / Patch release	0s
	1h 5m 30s

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