issue-1105 inmem HasSBOM: manage no hasSBOMSpec sent

[mrizzi]

Description of the PR

• checks for nil filter before retrieving by ID
• checks for nil filter in addHasSBOMIfMatch method to have c.convHasSBOM(link) to be executed

1st commit has the test reproducer for the issue so it's expected to fail the CI tests
2nd commit the fix (and should run fine the tests 😅 )

Fixes #1105

PR Checklist

• All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• All new changes are covered by tests
• If GraphQL schema is changed, make generate has been run
• If collectsub protobuf has been changed, make proto has been run
• All CI checks are passing (tests and formatting)
• All dependent PRs have already been merged