MSVC: Document and test behavior of empty MSVC_RUNTIME_LIBRARY
Extend tests added by !3211 (merged) to cover an empty value for the property. It should result in no specific setting.
Issue: #19108 (closed)
Extend tests added by !3211 (merged) to cover an empty value for the property. It should result in no specific setting.
Issue: #19108 (closed)