if there are no admins when trying to access the control panel, tell the user...

if there are no admins when trying to access the control panel, tell the user how to make an admin from SSH

management/daemon.py

@@ -71,8 +71,10 @@ def json_response(data):
 def index():
 	# Render the control panel. This route does not require user authentication
 	# so it must be safe!
+	no_admins_exist = (len([user for user in get_mail_users(env, as_json=True) if "admin" in user['privileges']]) == 0)
 	return render_template('index.html',
 		hostname=env['PRIMARY_HOSTNAME'],
+		no_admins_exist=no_admins_exist,
 	)
 
 @app.route('/me')

management/templates/login.html

+<h1 style="margin: 1em; text-align: center">{{hostname}}</h1>
+
+{% if no_admins_exist %}
+<div class="container">
+<div class="col-md-offset-2 col-md-8">
+  <p class="text-danger">There are no administrative users on this system! To make an administrative user,
+  log into this machine using SSH (like when you first set it up) and run:</p>
+  <pre>cd mailinabox
+sudo tools/mail.py user make-admin your@emailaddress.com</pre>
+  <hr>
+</div>
+</div>  
+{% endif %}
+
 <div class="row">
   <div class="col-sm-offset-2 col-sm-8 col-md-offset-3 col-md-6 col-lg-offset-4 col-lg-4">
     <center>
-      <h1 style="margin: 1em">{{hostname}}</h1>
       <p style="margin: 2em">Log in here for your Mail-in-a-Box control panel.</p>
     </center>
 
@@ -36,6 +49,7 @@
   </div>
 </div>
 
+
 <script>
 function do_login() {
   if ($('#loginEmail').val() == "") {