note
Sandy
Replace
<code>
my $c_enabling = param('enabling');
</code>
with
<code>
my $c_enabling = param('enabling') || '';
</code>
If $c_enabling can never have '0' as a valid input;
<p>
otherwise
<code>
my $c_enabling = param('enabling');
$c_enabling = '' unless defined $c_enabling;
</code>
<p>
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