Add default schema and use it in OpSpec argument queries.

[mzient]

Category:

New feature (non-breaking change which adds functionality) Breaking change (fix or feature that would cause existing functionality to not work as expected)

Description:

Prior to this change it was possible to construct an OpSpec with a name of a nonexistent schema, but it was impossible to query it for arguments - even ones that were present in the OpSpec. This change introduces a default schema which is used in argument queries in absence of a proper schema. This gives consistent results when querying for default values of built-in arguments.

Additional information:

Affected modules and functionalities:

OpSpec::[Try]Get[Repeated]Argument

Key points relevant for the review:

Tests:

OpSpecTest.EmptySchema

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

Checklist

Documentation

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

DALI team only

Requirements

• [ ] Implements new requirements
• [ ] Affects existing requirements
• [X] N/A

REQ IDs: N/A

JIRA TASK: N/A

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