title: Got an issue with Keyerror 0
body: <p>Got an error &quot;keyerror 0&quot; in the line &quot;for k, v in entries[0].items():&quot;. My code:</p>
  <pre><code>import requests
  import json
  
  session = requests.Session()
  session.headers['User-Agent'] = (
      f'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) '
      f'AppleWebKit/537.36 (KHTML, like Gecko) '
      f'Chrome/34.0.1847.131 Safari/537.36'
  )
  api_url = 'https://api.hh.ru/vacancies'
  response = session.get(api_url)
  entries = json.loads(response.text)
  
  # Let's check the first entry
  for k, v in entries[0].items():
      print(f'{k}: {v}')
  </code></pre>