Note that one cause for the error might be your addition of ... or die "Error at process: $!". You don't do this in your test script that works from the command line.
To get a better description of the error (if there is an error raised), I would wrap the offending line in an eval {} block:
my $ok = eval {
$value = $hr->process($value);
1;
};
if( ! $ok ) {
die $@; # reraise our error
};
If that still leaves an empty value in $value, then maybe the problem is in HTML::Restrict. Maybe you need to pass it some rules as to what is allowed.
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