Few changes.

modoboa/lib/middleware.py

@@ -37,7 +37,7 @@ class CommonExceptionCatcher(object):
                 unicode(exception), status=exception.http_code
             )
         return _render_error(
-            request, user_context=dict(error=str(exception))
+            request, user_context=dict(error=unicode(exception))
         )
 
 

modoboa/templates/common/viewmail.html

@@ -6,9 +6,11 @@
     <link rel="stylesheet" type="text/css" href="{% static 'css/viewmail.css' %}" />
   </head>
   <body>
-    <div id="table-container">
-      {{ headers }}
-    </div>
+    {% if headers %}
+      <div id="table-container">
+        {{ headers }}
+      </div>
+    {% endif %}
     {{ mailbody|safe }}
   </body>
 </html>

modoboa/urls.py

@@ -37,7 +37,7 @@ if extra_routes:
 
 # API urls
 urlpatterns += [
-    url("^docs/api/", include_docs_urls(title=API_TITLE)),
+    url("^docs/api/", include_docs_urls(title=API_TITLE, public=False)),
     url("^api/v1/", include("modoboa.urls_api", namespace="api")),
 ]