Fix None to 'null' when calling Topology.to_json(pretty=True) #150
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In current version, when you call Topology.to_json(pretty=True) on data with properties set to None, it will output None in the result. None is not valid JSON syntax, None should be replace with null
For more info, please look at this issue: #149
This PR includes a fix to that issue, and a test case for the test suite