Files
test/source
Campbell Barton a360bd3f31 Cleanup: use std::optional instead of empty strings for return values
When a string shouldn't be used or is invalid, use std::nullopt to
make it clear it's value shouldn't be used.

Without this it's possible to accidentally use an empty string
which will silently fail.
2024-01-30 15:56:08 +11:00
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