smart_date-3544983: Check if $data is scalar
Update SmartDateNormalizer::denormalize() to detect when it is receiving:
A scalar/NULL value (per-property denormalization) → delegate to TimestampNormalizer.
Closes #3544983
Update SmartDateNormalizer::denormalize() to detect when it is receiving:
A scalar/NULL value (per-property denormalization) → delegate to TimestampNormalizer.
Closes #3544983