Fix null arg input access

[mzient]

Category:

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

Description:

ClearWorkspacePayload can iterate over argument inputs in an incomplete workspace, resulting, in some cases, in a NULL pointer dereference. This PR adds an ArgumentInputPtr function which can be used to safely determine whether the input is null and it also adds assertions to normal access functions.

Additional information:

Affected modules and functionalities:

New executor (use pointer instead of reference and check whether it's null).
Workspace (asserts, one new function).

Key points relevant for the review:

Tests:

Covered by future PR #5528.
Regressions covered by executor2/*test

• Existing tests apply
• New tests added
  • Python tests
  • GTests
  • Benchmark
  • Other
• N/A

Checklist

Documentation

• Existing documentation applies
• Documentation updated
  • Docstring
  • Doxygen
  • RST
  • Jupyter
  • Other
• N/A

DALI team only

Requirements

• Implements new requirements
• Affects existing requirements
• N/A

REQ IDs: N/A

JIRA TASK: N/A

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