title: Django conditional template tag library loader
body: <p>I'm working on a Django app that provides templates with optional functionality if certain other apps are available.</p>
  
  <p>It's not possible to load an unavailable template tag library using the standard <code>{% load %}</code> Django tag. Trying to do that results in a <code>TemplateSyntaxError</code>.</p>
  
  <p>Has anyone come up with a solution to this problem? I.E. a conditional tag lib loader so I can do something like this:</p>
  
  <p><code>{% load_if_available app_tags %}</code></p>
  
  <p>and</p>
  
  <p><code>{% if_loaded app_tags %}{% endif %}</code></p>