Update __init__.py

There's a seldom issue I encountered with a 32bit Server 2008 in which the Servername isn't formatted nicely (also not in the Webui) which brings the wrapper to a halt. Please review the adittion that solved the issue for me.
This is my first pull request whatsoever so maybe I have overseen something else in the overall procedure...

Author: m-d-f

urbackup_api/__init__.py

@@ -92,7 +92,7 @@ def _get_json(self, action, params = {}):
                 logger.error("API call failed. Retrying...")
 
         data = response.read();
-        
+        data = data.decode('utf-8','ignore').encode('utf-8')
         response.close()
 
         return json.loads(data.decode("utf-8"))