avoid warnings in error.log when non-defined strings
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@ -1037,6 +1037,7 @@ sub limpia_cadena {
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################################################################################
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sub clean_blank {
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my $input = $_[0];
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return $input unless defined($input);
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$input =~ s/^\s+//g;
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$input =~ s/\s+$//g;
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return $input;
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