Make the /harvest page more robust if source.status is not set

This prevents exceptions from appearing in the log from Jinja:
  [error] [client 1.2.3.4] Error - <class 'jinja2.exceptions.UndefinedError'>: 'dict object' has no attribute 'status'

ckanext/harvest/templates_new/snippets/source_item.html

@@ -38,7 +38,9 @@ Example:
     {% endif %}
 
     <p class="muted">
-      {{ _('Datasets') }}: {{ source.status.total_datasets }}
+      {% if source.status %}
+        {{ _('Datasets') }}: {{ source.status.total_datasets }}
+      {% endif %}
       {% if not within_organization and source.organization %}
       &mdash; {{ _('Organization') }}: {{ h.link_to(source.organization.title or source.organization.name, h.url_for('organization_read', id=source.organization.name)) }}</a>
       {% endif %}

ckanext/harvest/templates_new/source/admin.html

@@ -3,7 +3,7 @@
 {% block primary_content_inner %}
   <section class="module-content">
     <h1>Last Harvest Job</h1>
-    {% if source.status.last_job %}
+    {% if source.status and source.status.last_job %}
       {% snippet "snippets/job_details.html", job=source.status.last_job %}
       <div class="form-actions">
         <a href="{{ h.url_for(controller='ckanext.harvest.controllers.view:ViewController', action='show_last_job', source=source.name) }}" class="btn pull-right">

ckanext/harvest/templates_new/source/admin_base.html

@@ -8,7 +8,7 @@
 {% endblock %}
 
 {% block actions_content %}
-  {% if source.status.last_job and (source.status.last_job.status == 'New' or source.status.last_job.status == 'Running') %}
+  {% if source.status and source.status.last_job and (source.status.last_job.status == 'New' or source.status.last_job.status == 'Running') %}
     <li><a class="btn disabled" rel="tooltip" title="There already is an unrun job for this source"><i class="icon-refresh icon-large"></i> Reharvest</a></li>
   {% else %}
     {% set locale = h.dump_json({'content': _('This will re-run the harvesting for this source. Any updates at the source will overwrite the local datasets. Sources with a large number of datasets may take a significant amount of time to finish harvesting. Please confirm you would like us to start reharvesting.')}) %}

ckanext/harvest/templates_new/source/read_base.html

@@ -21,8 +21,15 @@
       {% endif %}
       <div class="nums">
         <dl>
-          <dt>{{ _('Datasets') }}</dt>
-          <dd>{{ c.harvest_source.status.total_datasets }}</dd>
+            <dt>
+               {{ _('Datasets') }}
+            </dt>
+
+            <dd>
+               {% if c.harvest_source.status %}
+                  {{ c.harvest_source.status.total_datasets }}
+               {% endif %}
+            </dd>
         </dl>
       </div>
     </section>