fix: deal with NULL in FromDatum implementation for bytea type in Cell
#502
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What kind of change does this PR introduce?
This PR is to fix incorrect NULL processing in FromDatum implementation for
byteatype in Cell.What is the current behavior?
It didn't deal with NULL case properly and always return NOT NULL.
What is the new behavior?
Deal with NULL case correctly just like other data types.
Additional context
N/A