title: Unable to fetch service now tickets using assignment_group
body: <p>I am unable to retrieve tickets from service now by matching assignment_group. I am using pysnow and using table api to retrieve ticket from service now.</p>
  
  <p>Below is my code :</p>
  
  <pre><code>import pysnow
  c = pysnow.Client(instance='myinstance', user='username', password='password')
  incident = c.resource(api_path='/table/incident')
  
  #getting the assignment group of a ticket 
  print ("tickets are")
  response = incident.get(query={'number': 'INC0010020'}, stream=True)
  a = response['assignment_group']
  print (a)
  
  #using the same assigment group above to fetch more tickets
  response = incident.get(query={'assignment_group' : a}, stream=True)
  print (response.one())
  </code></pre>
  
  <p>I get the below result :</p>
  
  <p><a href="https://i.stack.imgur.com/8NKWF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8NKWF.png" alt="enter image description here"></a></p>