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template.html

views.py

<!DOCTYPE html>
<html>
<body>

{% for x in colors %}
  <h1>{{ x|default_if_none:"nocolor" }}</h1>
{% endfor %}

<p>In views.py you can see what the colors variable looks like.</p>

</body>
</html>

from django.http import HttpResponse
from django.template import loader

def testing(request):
  template = loader.get_template('template.html')
  context = {
    'colors': ['Red', None, 'Blue', '', 'Yellow']
  }
  return HttpResponse(template.render(context, request))