Scale assignment optimization

Changed string in the function: make_avsc_object (from the file "schema.py"):
scale = 0 if json_data.get("scale") is None else json_data.get("scale") -> scale = json_data.get("scale", 0)
 
By Python documentation:
get(self, key, default=None, /)
    Return the value for key if key is in the dictionary, else default.
 
It is more effective and readable than previous version.