added messages for cases of null sets

assignments/templates/assignments/ListView.html

 {% extends 'base.html' %}
+{% load static %}
 
 {% block styles %}
-{% load static %}
 <link rel="stylesheet" type="text/css" href="{% static 'assignments/css/style.css' %}">
 {% endblock %}
 
 {% block title %}Assignments{% endblock %}
 
-{% block content %}
+{% block header %}Assignments Per Course{% endblock %}
 
-<h1>Assignments Per Course</h1>
-<p>List of courses:</p>
-<ul>
+{% block content %}
+<p id="table-caption">List of courses:</p>
+{% if all_courses.count == 0 %}
+<p id="no-courses">No courses found.</p>
+{% else %}
+<ul id="table">
     {% for course in all_courses %}
     <li>{{course.code}} {{course.title}} {{course.section}}</li>
     <ul>
+        {% if course.assignment_set.all.count == 0 %}
+        <li>No assignments found.</li>
+        {% else %}
         {% for assignment in course.assignment_set.all %}
         <a href='{{request.path}}{{assignment.pk}}/details'><li>{{assignment.name}}</li></a>
         {% endfor %}
+        {% endif %}
     </ul>
     {% endfor %}
 </ul>
+{% endif %}
 {% endblock %}
\ No newline at end of file