Allow vulns to be imported without a service

[DJensen94]

Allow vulnerabilities to be added without a service

🗣 Description

If a vuln doesn't have a port associated with it don't attempt to create a service and insert the vuln without the service

💭 Motivation and context

Credential breaches don't link back to a given service, so they were failing to insert.

🧪 Testing

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.

[cduhn17]

LGTM

[aloftus23]

Looks good