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$myhash{$val_1} = $val_2 // '';

$myhash{$val_1} = defined $val_2 ? $val_2 : '';

foreach $val_1 (keys %myhash) {
   no warnings 'uninitialized';
   print "myhash{$val_1} = $myhash{$val_1}\n";
}