Django-cms multiple inheritance does not work. 

I have the following template structure:

```
base.html
    {% block content %}
    {% endblock content %}

page1.html
    {% extends "base.html" %}
    {% block test %}
    {% endblock test %}

page2.html
    {% extends "page1.html" %}
    {% block content %}
          <div>foo</div>
    {% endblock content %}
    {% block test %}
          <div>foo</div>
    {% endblock test %}

```

The problem is that the block test in page2 HTML is not rendered. Only the blocks from base.html are rendered. If I include block test in base.html is also gets rendered in page2