add checks for items length #416

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Red Hat Konflux/instaslice-daemonset-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	5 seconds	init
✅ Succeeded	21 seconds	clone-repository
✅ Succeeded	9 seconds	prefetch-dependencies
✅ Succeeded	9 minutes	build-images
✅ Succeeded	3 minutes	build-images
✅ Succeeded	10 seconds	build-image-index
✅ Succeeded	6 seconds	apply-tags
✅ Succeeded	22 seconds	build-source-image
✅ Succeeded	3 minutes	clamav-scan
✅ Succeeded	8 seconds	push-dockerfile
✅ Succeeded	13 seconds	rpms-signature-scan
✅ Succeeded	7 seconds	deprecated-base-image-check
✅ Succeeded	51 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	17 seconds	sast-snyk-check
✅ Succeeded	33 seconds	clair-scan
✅ Succeeded	7 seconds	show-sbom