Node-Agent crash: panic no ':' separator in digest #853

Description
Node-Agent pod restarts many times. It crashes with a panic when trying to process container image metadata. The error says:
panic: no ':' separator in digest ""
This happens when SBOM manager works with images that do not have a proper digest.

Environment

• OS: OpenShift 4.x (RHEL CoreOS)
• Kubescape Version: Operator 1.40.2, Node-Agent image quay.io/kubescape/node-agent:v0.3.119
• Cluster: On-prem OpenShift (not cloud)

Steps To Reproduce

• Install Kubescape Operator with Node-Agent in OpenShift.
• Run workloads that use images without digest (for example :latest).
• Node-Agent tries to generate SBOM.
• Pod crashes and restarts.

Expected Behavior
Node-Agent should continue running even if an image has no digest. SBOM manager should skip or handle this case safely.

Actual Behavior
Pod crashes with panic and restarts many times. Logs show:
panic: no ':' separator in digest ""