Render a nicer warning box if plugin template not found
{# instead of throwing an exception, just render a warning message #}
-<p class="bg-danger">The chosen template '{{ instance.glossary.render_template }}' could not be found.</p>
\ No newline at end of file
+<div class="alert alert-danger" role="alert">The chosen template '{{ instance.glossary.render_template }}' could not be found.</div>
\ No newline at end of file
