If the column is undefined, then it should be an empty string according to your API spec.
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} foreach my $column (@{$hint->{string_columns}}) { $json{$column} = $self->get_column($column) // "";
}
foreach my $column (@{$hint->{string_columns}}) {
$json{$column} = $self->get_column($column) // "";
columns => [
string_columns => [
description => undef,
description => "",
homepage => undef,
homepage => "",