Docserver: Reorganise the site templates into a single site.html file which

chrome/common/extensions/docs/server2/table_of_contents_renderer.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from extensions_paths import PRIVATE_TEMPLATES
+from file_system import FileNotFoundError
 
 
 class TableOfContentsRenderer(object):
   '''Renders a table of contents pulled from a list of DocumentSections
   returned from document_parser.ParseDocument.
 
   This performs key functionality of DocumentRenderer, pulled into its own
   class for testability.
   '''
 
   def __init__(self, host_file_system, compiled_fs_factory):
     self._templates = compiled_fs_factory.ForTemplates(host_file_system)
 
   def Render(self, sections):
     '''Renders a list of DocumentSections |sections| and returns a tuple
     (text, warnings).
     '''
-    table_of_contents_template = self._templates.GetFromFile(
-        '%s/table_of_contents.html' % PRIVATE_TEMPLATES).Get()
+    path = '%s/table_of_contents.html' % PRIVATE_TEMPLATES
+    try:
+      table_of_contents_template = self._templates.GetFromFile(path).Get()
+    except FileNotFoundError:
+      return '', ['%s not found' % path]
 
     def make_toc_items(entries):
       return [{
         'attributes':  [(key, val) for key, val in entry.attributes.iteritems()
                         if key != 'id'],
         'link':        entry.attributes.get('id', ''),
         'subheadings': make_toc_items(entry.entries),
         'title':       entry.name,
       } for entry in entries]
 
     toc_items = []
     for section in sections:
       items_for_section = make_toc_items(section.structure)
       if toc_items and items_for_section:
         items_for_section[0]['separator'] = True
       toc_items.extend(items_for_section)
 
     table_of_contents = table_of_contents_template.Render({
       'items': toc_items
     })
     return table_of_contents.text, table_of_contents.errors