[tool-config] handle unset and default arguments consistently
Bug: T402572
Bug: T401648
Needed-By: !119 (merged)
Depends-On: !140 (merged)
Signed-off-by: raymond-ndibe rndibe@wikimedia.org
Edited by David Caro
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Bug: T402572
Bug: T401648
Needed-By: !119 (merged)
Depends-On: !140 (merged)
Signed-off-by: raymond-ndibe rndibe@wikimedia.org