Deal with missing stats

public/templates/public/process.html

@@ -154,6 +154,7 @@ See: <a href="http://lists.debian.org/debian-project/2010/09/msg00026.html">hand
             {% endif %}
         </td>
     </tr>
+    {% if mbox_stats %}
     <tr><th>Mailbox stats</th>
         <td>{{mbox_stats.date_first_py|date:"Y-m-d"}} to {{mbox_stats.date_last_py|date:"Y-m-d"}},
             {{mbox_stats.num_mails}} mails,
@@ -165,6 +166,7 @@ See: <a href="http://lists.debian.org/debian-project/2010/09/msg00026.html">hand
         </td>
     </tr>
     {% endif %}
+    {% endif %}
 </table>
 {% if "edit_bio" in vperms.perms or "edit_ldap" in vperms.perms %}
 <a href="{% url 'restricted_person' key=person.lookup_key %}">Edit personal information</a>

public/views.py

@@ -227,13 +227,14 @@ class Process(VisitorTemplateView):
 
         stats = stats.get("process", {})
         stats = stats.get(process.lookup_key, {})
-        stats["date_first_py"] = datetime.datetime.fromtimestamp(stats["date_first"])
-        stats["date_last_py"] = datetime.datetime.fromtimestamp(stats["date_last"])
-        if "median" not in stats or stats["median"] is None:
-            stats["median_py"] = None
-        else:
-            stats["median_py"] = datetime.timedelta(seconds=stats["median"])
-            stats["median_hours"] = stats["median_py"].seconds // 3600
+        if stats:
+            stats["date_first_py"] = datetime.datetime.fromtimestamp(stats["date_first"])
+            stats["date_last_py"] = datetime.datetime.fromtimestamp(stats["date_last"])
+            if "median" not in stats or stats["median"] is None:
+                stats["median_py"] = None
+            else:
+                stats["median_py"] = datetime.timedelta(seconds=stats["median"])
+                stats["median_hours"] = stats["median_py"].seconds // 3600
         ctx["mbox_stats"] = stats
         return ctx