fix(sbom): add check for CreationInfo to nil when detecting SPDX created using Trivy

[DmitriyLewen]

Description

We get panic if CreationInfo doesn't exist (see #6344).
add check for CreationInfo to nil when detecting SPDX created using Trivy.

Related issues

• Close Regression in 0.50.0 - SIGSEGV scanning some container images #6344

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