fix: runtime panic when `storage` param is empty #10

Job	Run time
lint	1m 8s
container_quality_dockerfile_lint	8s
build_scan_container_image	10m 17s
Go Test	7m 2s
build_go_binary (amd64)	46s
build_go_binary (arm64)	57s
gosec_scan	14s
Validate YAML	11s
./tests/e2e-chainsaw/v1beta2/teardown/	5m 34s
./tests/e2e-chainsaw/v1beta2/setup/	6m 37s
./tests/e2e-chainsaw/v1beta2/hostnetwork/	10m 35s
./tests/e2e-chainsaw/v1beta2/password/	10m 41s
./tests/e2e-chainsaw/v1beta2/ha-setup/	10m 5s
./tests/e2e-chainsaw/v1beta2/ha-failover/	9m 34s
./tests/e2e-chainsaw/v1beta2/nodeport/	10m 45s
./tests/e2e-chainsaw/v1beta2/pvc-name/	6m 30s
./tests/e2e-chainsaw/v1beta2/keep-pvc/	5m 38s
./tests/e2e-chainsaw/v1beta2/acl-user/	10m 30s
./tests/e2e-chainsaw/v1beta2/scaling/	18m 3s
./tests/e2e-chainsaw/v1beta2/ignore-annots/	5m 26s
	2h 10m 41s

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