Merge pull request #1565 from MarcAbonce/fix_duck_images

# run query in site to get vqd number needed for requesting images

# TODO: find a way to get this number without an extra request (is it a hash of the query?)

def get_vqd(query):

    res = get(site_url.format(query=urlencode({'q': query})))

def get_vqd(query, headers):

    query_url = site_url.format(query=urlencode({'q': query}))

    res = get(query_url, headers=headers)

    content = res.text

    if content.find('vqd=\'') == -1:

        raise Exception('Request failed')

    vqd = content[content.find('vqd=\'') + 5:]

    vqd = vqd[:vqd.find('\'')]

    return vqd

def request(query, params):

    # to avoid running actual external requests when testing

    if 'is_test' not in params:

        vqd = get_vqd(query)

        vqd = get_vqd(query, params['headers'])

    else:

        vqd = '12345'

    try:

        res_json = loads(content)

    except:

        return []

        raise Exception('Cannot parse results')

    # parse results

    for result in res_json['results']:

        self.assertRaises(AttributeError, duckduckgo_images.response, '[]')

        response = mock.Mock(text='If this error persists, please let us know: ops@duckduckgo.com')

        self.assertEqual(duckduckgo_images.response(response), [])

        self.assertRaises(Exception, duckduckgo_images.response, response)

        json = u"""

        {