Small fixes in NTLM

[rvazarkar]

Description

Correct a null pointer issue in NTLM post, fixes the edge panels
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Motivation and Context

This PR addresses: [GitHub issue or Jira ticket number]

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Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: Issues and Pull Requests README #672
  • Read the Contributing guide: https://github.com/SpecterOps/BloodHound/wiki/Contributing
• I have ensured that related documentation is up-to-date
  • Open API docs
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• I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed