Fais la distinction entre un baseinvoice avec et sans objet facture.

logs/templates/logs/aff_summary.html

@@ -110,11 +110,16 @@ with this program; if not, write to the Free Software Foundation, Inc.,
         <tr>
             <td>{{ v.datetime }}</td>
             <td>
-                {% blocktrans with username=v.username number=v.version.object.number name=v.version.object.name %}{{ username }} has sold {{ number }}x {{ name }} to{% endblocktrans %}
+                {% blocktrans with username=v.username number=v.version.object.number name=v.version.object.name %}{{ username }} has sold {{ number }}x {{ name }}{% endblocktrans %}
-                <a href="{% url 'users:profil' v.version.object.facture.user_id %}">{{ v.version.object.facture.user.get_username }}</a>
+                {% with invoice=v.version.object.facture %}
+                {% if invoice|is_facture %}
+                {% trans " to" %}
+                <a href="{% url 'users:profil' v.version.object.facture.facture.user_id %}">{{ v.version.object.facture.facture.user.get_username }}</a>
                 {% if v.version.object.iscotisation %}
                     (<i>{% blocktrans with duration=v.version.object.duration %}+{{ duration }} months{% endblocktrans %}</i>)
                 {% endif %}
+                {% endif %}
+                {% endwith %}
             </td>
             {% can_edit_history %}
             <td>

logs/templatetags/logs_extra.py

@@ -19,7 +19,7 @@
 #
 # You should have received a copy of the GNU General Public License along
 # with this program; if not, write to the Free Software Foundation, Inc.,
-# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# 51 Franklin Street, Fifth Floor, Boston, MA 021}10-1301 USA.
 """logs.templatetags.logs_extra
 A templatetag to get the class name for a given object
 """
@@ -34,6 +34,10 @@ def classname(obj):
     """ Returns the object class name """
     return obj.__class__.__name__
 
+@register.filter
+def is_facture(baseinvoice):
+    """Returns True if a baseinvoice has a `Facture` child."""
+    return hasattr(baseinvoice, 'facture')
 
 @register.inclusion_tag('buttons/history.html')
 def history_button(instance, text=False, html_class=True):