If there's no difference between undef and the nul string (""), you could canonize the values.

for ($pname, $policy_ur, $odate) {
   if (!defined($_)) { $_ = ''; }
}

if ($pname ne '' && $policy_ur ne '' && $odate ne '') {
   ...
}
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Or the other way around:

for ($pname, $policy_ur, $odate) {
   if (defined($_) && $_ eq '') { undef $_; }
}

if (!defined($pname) && !defined($policy_ur) && !defined($odate)) {
   ...
}
[download]