Only display terminals in dashboard if terminals are available

IPython/html/notebookapp.py

@@ -173,6 +173,7 @@ class NotebookWebApplication(web.Application):
             mathjax_url=ipython_app.mathjax_url,
             config=ipython_app.config,
             jinja2_env=env,
+            terminals_available=False,  # Set later if terminals are available
         )
 
         # allow custom overrides for the tornado web app.
@@ -765,10 +766,9 @@ class NotebookApp(BaseIPythonApplication):
         try:
             from .terminal import initialize
             initialize(self.web_app)
-            self.web_app.terminals_available = True
+            self.web_app.settings['terminals_available'] = True
         except ImportError as e:
             self.log.info("Terminals not available (error was %s)", e)
-            self.web_app.terminals_available = False
 
     def init_signal(self):
         if not sys.platform.startswith('win'):

IPython/html/static/tree/js/main.js

@@ -46,7 +46,11 @@ require([
     kernel_list = new kernellist.KernelList('#running_list',  $.extend({
         session_list:  session_list}, 
         common_options));
-    terminal_list = new terminallist.TerminalList('#terminal_list', common_options);
+    
+    if (utils.get_body_data("terminalsAvailable") === "True") {
+        terminal_list = new terminallist.TerminalList('#terminal_list', common_options);
+    }
+
     login_widget = new loginwidget.LoginWidget('#login_widget', common_options);
 
     $('#new_notebook').click(function (e) {

IPython/html/templates/tree.html

@@ -12,6 +12,7 @@
 
 data-base-url="{{base_url}}"
 data-notebook-path="{{notebook_path}}"
+data-terminals-available="{{terminals_available}}"
 
 {% endblock %}
 
@@ -24,7 +25,9 @@ data-notebook-path="{{notebook_path}}"
     <ul id="tabs" class="nav nav-tabs">
         <li class="active"><a href="#notebooks" data-toggle="tab">Notebooks</a></li>
         <li><a href="#running" data-toggle="tab">Running</a></li>
+      {% if terminals_available %}
         <li><a href="#terminals" data-toggle="tab">Terminals</a></li>
+      {% endif %}
         <li><a href="#clusters" data-toggle="tab">Clusters</a></li>
     </ul>
 
@@ -80,7 +83,8 @@ data-notebook-path="{{notebook_path}}"
             </div> 
         </div>
     </div>
-    
+
+  {% if terminals_available %}
     <div id="terminals" class="tab-pane">
 
         <div id="terminal_toolbar" class="row">
@@ -101,6 +105,7 @@ data-notebook-path="{{notebook_path}}"
             </div>
         </div>
     </div>
+  {% endif %}
     
     <div id="clusters" class="tab-pane">
 

IPython/html/tree/handlers.py

@@ -55,7 +55,8 @@ class TreeHandler(IPythonHandler):
             self.write(self.render_template('tree.html',
                 page_title=page_title,
                 notebook_path=path,
-                breadcrumbs=breadcrumbs
+                breadcrumbs=breadcrumbs,
+                terminals_available=self.settings['terminals_available'],
             ))