Здравствуйте!
Ребят подскажите пожалуйста, как исправить косяк.

Закомментил (<"!"--… -->) в html-редакторе сайта некоторые строчки главной страницы сайта.
Не посмотрел и закомментил «важные» поля. Итого главная страница «умерла». Возврат к дефолтным значениям — не помог.

Итого:
Сообщение об ошибке:
'NoneType' object has no attribute '_fields'

QWeb
Could not render element 'div'

Отслеживать снизу вверх

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/openerp/addons/website/models/ir_http.py", line 204, in _handle_exception
    response = super(ir_http, self)._handle_exception(exception)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_http.py", line 100, in _handle_exception
    return request._handle_exception(exception)
  File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 659, in _handle_exception
    return super(HttpRequest, self)._handle_exception(exception)
  File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 1358, in get_response
    result.flatten()
  File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 1231, in flatten
    self.response.append(self.render())
  File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 1225, in render
    context=request.context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/website/models/ir_ui_view.py", line 172, in render
    return super(view, self).render(cr, uid, id_or_xml_id, values=values, engine=engine, context=context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_ui_view.py", line 1029, in render
    return self.pool[engine].render(cr, uid, id_or_xml_id, qcontext, loader=loader, context=context)
  File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 259, in render
    return self.render_node(self.get_template(id_or_xml_id, qwebcontext), qwebcontext)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 298, in render_node
    result = self.render_element(element, template_attributes, generated_attributes, qwebcontext)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 319, in render_element
    g_inner.append(self.render_node(current_node, qwebcontext))
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 296, in render_node
    result = self._render_tag[t_render](self, element, template_attributes, generated_attributes, qwebcontext)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 434, in render_tag_call
    d[0] = self.render_element(element, template_attributes, generated_attributes, d)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 298, in render_node
    result = self.render_element(element, template_attributes, generated_attributes, qwebcontext)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 319, in render_element
    g_inner.append(self.render_node(current_node, qwebcontext))
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 298, in render_node
    result = self.render_element(element, template_attributes, generated_attributes, qwebcontext)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 324, in render_element
    raise_qweb_exception(message="Could not render element %r" % element.tag, node=element, template=template)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 319, in render_element
    g_inner.append(self.render_node(current_node, qwebcontext))
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 296, in render_node
    result = self._render_tag[t_render](self, element, template_attributes, generated_attributes, qwebcontext)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_qweb.py", line 481, in render_tag_field
    field = record._fields[field_name]
QWebException: 'NoneType' object has no attribute '_fields'

Стоит простая задача — как на стороне сервера отредактировать шаблон website.homepage?

Rolex , если нет критичных исправлений, то можно обновить модуль website. Он вернет все шаблоны на исходную.