[repository] when deleting relations of a deleted external entity, we should skip non-crossable relation (closes #1973680)
elses this may lead to things as described in the ticket...
{% extends "basic/layout.html" %}
{% block header %}
<div class="header">
<a href="http://www.cubicweb.org">
<img alt="cubicweb logo" src="{{ pathto('_static/cubicweb.png', 1) }}"/>
</a>
</div>
{% endblock %}
{# puts the sidebar into "sidebar1" block i.e. before the document body #}
{% block sidebar1 %}{{ sidebar() }}{% endblock %}
{% block sidebar2 %}{% endblock %}