Update packages: jinja2, pyyaml

[kvch]

When searching using the theme "simple" the following exception shows up:

[2019-01-07 18:44:03,339] ERROR in app: Exception on / [POST]
Traceback (most recent call last):
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "searx/webapp.py", line 600, in index
    favicons=global_favicons[themes.index(get_current_theme_name())]
  File "searx/webapp.py", line 397, in render
    '{}/{}'.format(kwargs['theme'], template_name), **kwargs)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/flask/templating.py", line 133, in render_template
    return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list),
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 869, in get_or_select_template
    return self.get_template(template_name_or_list, parent, globals)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 830, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 804, in _load_template
    template = self.loader.load(self, name, globals)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/jinja2/loaders.py", line 125, in load
    code = environment.compile(source, name, filename)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 591, in compile
    self.handle_exception(exc_info, source_hint=source_hint)
  File "/home/n/p/searx/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/n/p/searx/searx/templates/simple/results.html", line 9, in template
    {% if results and results|map(attribute='template')|unique|list|count == 1 %}
TemplateAssertionError: no filter named 'unique'

The missing function is part of Jinja2 2.10, but not 2.9.

Pyyaml is update because the following vulnerability has come to daylight: https://nvd.nist.gov/vuln/detail/CVE-2017-18342 The fix is based on this: yaml/pyyaml#243 (comment)

[dalf]

Yes, also,
I would upgrade requests to 2.21.0 because the version 2.19.1 has the CVE-2018-18074 (not a concern for searx, but still).

requirements.txt fully updated :

certifi==2018.11.29
flask==1.0.2
flask-babel==0.11.2
pygments==2.1.3
pyyaml==3.13
python-dateutil==2.7.5
pyopenssl==19.0.0
lxml==4.3.0
idna==2.8
requests[socks]==2.22.0

• certifi : never updated since a long time
• lxml 4.3.0 : The module lxml.sax is compiled using Cython in order to speed it up.
• pyOpenSSL 19.0.0 : now works with OpenSSL 1.1.1

(sorry for the long long delay).