SbomOccurrence input_file_blob_path is nil if project is nil

Ryan Wellsrequested to merge
rw/578065-occurrence-check-project-for-blob-path into master

What does this MR do and why?

Fixes: #578065

We have detected that orphaned SbomOccurrence records can exist when the project they relate to is deleted. This will eventually be fixed, but this change is a plaster-fix to ensure the dependency export can function properly.

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