"Allow mapping the string '0' to a term name." causes problems because now taxonomy terms can never be empty

I have a CSV feed with a column that is mapped to a taxonomy term. It is set to not create new terms. I use the CSV feed to update users and I don't want it to empty fields that are left empty.

This works for normal textfields but taxonomy term columns that are left empty result in emptying the term field.

It is caused by this part of code in the taxonomy.inc file:

function taxonomy_feeds_set_target($source, $entity, $target, $terms, $mapping = array()) {

  // Allow mapping the string '0' to a term name.
  if (empty($terms) && $terms != 0) {
    return;
  }

I don't think that this if statement can ever evaluate to true? (I'm not sure about all the edge cases tho)

But I think that it should be this:

function taxonomy_feeds_set_target($source, $entity, $target, $terms, $mapping = array()) {

  // Allow mapping the string '0' to a term name.
  if (empty($terms) && $terms !== 0) {
    return;
  }