title: Python replace None values in nested JSON
body: <p>I have been trying to wrap my head around replacing the None values in the JSON dictionary below. How would I traverse this json, and replace the "None" values with empty strings? I'm having difficulty understanding how to traverse nested json. Would love if someone can help me with this. Example nested json below. 
  OR is there a way to replace values (such as from None to empty string) when using doing a "get" request with the Requests library in python?</p>
  
  <pre><code>{  
     'house':{  
        'amount':'$0.00',
        'id':1,
        'value':0.0
     },
     'event':'12.199.136.146',
     'location':'',
     'language':{  
        'language_name':'English',
        'language_id':1,
        'language_symbol':None
     },
     'percentage':1.0,
     'identification':'',
     'source':{  
        'name':'john',
        'id':-1
     },
     'paid':{  
        'amount':'$0.00',
        'format':1,
        'value':0.0
     },
     'score':None
  }
  </code></pre>