dropEmptyInitThenConcatStringsSep: Allow it to drop items again #11130

Job	Run time
Check Cachix and Docker secrets present for installer tests	1s
vm_tests	21m 50s
meson_build (ubuntu-latest)	11m 2s
meson_build (macos-latest)	4m 30s
tests (ubuntu-latest)	47m 27s
tests (macos-latest)	34m 22s
installer	47m 12s
docker_push_image	0s
installer_test (ubuntu-latest)	28s
installer_test (macos-latest)	1m 7s
	2h 47m 59s

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