Allow spaces in XML replies.

[pithos] / pithos / api / templates / hashes.xml

<?xml version="1.0" encoding="UTF-8"?>

<object name="{{ object }}" bytes="{{ bytes }}" block_size="{{ block_size }}" block_hash="{{ block_hash }}">
  {% for hash in hashes %}
  <hash>{{ hash }}</hash>
  {% endfor %}
</object>