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!defined and $_ = ' ' for @$row;

for (@$row) {
   !defined and $_ = ' ';
}

for (@$row) {
   if (!defined) {
      $_ = ' ';
   }
}

for $_ (@$row) {
   if (!defined($_) {
      $_ = ' ';
   }
}

for my $i (0..$#$row) {
   if (!defined($row->[$i]) {
      $row->[$i] = ' ';
   }
}

$_ //= '' for @$row;