Don’t show progress once notifications are gone

We work out how complete a job’s processing is by looking at how many
notifications have been created.

Later, we deleted all the notifications, according to the data retention
schedule. This makes it look like the job has gone back to 0% processed.

This commit accounts for this by not showing the % complete message once
a finished job has had its notifications deleted.

app/templates/partials/jobs/notifications.html

@@ -28,7 +28,7 @@
       {% if template.template_type == 'letter' %}
         <div class="keyline-block bottom-gutter-1-2">
       {% endif %}
-        {% if percentage_complete < 100 %}
+        {% if percentage_complete < 100 and job.job_status != 'finished' %}
           <p class="{% if template.template_type != 'letter' %}bottom-gutter{% endif %} hint">
             Report is {{ "{:.0f}%".format(percentage_complete * 0.99) }} complete…
           </p>