Config: Fix panic on invalid `lua-shared-dict`. #11061

Job	Run time
changes	7s
test-go	3m 48s
Verify Doc generation	14s
Build	3m 59s
Chart / Test	0s
Kubernetes (v1.26.15) / Kubernetes	51m 33s
Kubernetes (v1.27.13) / Kubernetes	47m 22s
Kubernetes (v1.28.9) / Kubernetes	45m 7s
Kubernetes (v1.29.4) / Kubernetes	52m 33s
Kubernetes (v1.30.0) / Kubernetes	46m 27s
Kubernetes chroot (v1.26.15) / Kubernetes CHROOT	51m 29s
Kubernetes with Validations (v1.27.13) / Kubernetes VALIDATIONS	47m 12s
Kubernetes with Validations (v1.28.9) / Kubernetes VALIDATIONS	45m 25s
Kubernetes with Validations (v1.26.15) / Kubernetes VALIDATIONS	50m 16s
Kubernetes with Validations (v1.29.4) / Kubernetes VALIDATIONS	45m 52s
Kubernetes with Validations (v1.30.0) / Kubernetes VALIDATIONS	51m 37s
Kubernetes chroot (v1.27.13) / Kubernetes CHROOT	50m 55s
Kubernetes chroot (v1.28.9) / Kubernetes CHROOT	45m 16s
Kubernetes chroot (v1.29.4) / Kubernetes CHROOT	48m 11s
Kubernetes chroot (v1.30.0) / Kubernetes CHROOT	45m 3s
	12h 12m 26s

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