Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/718
@justinleet, the value side of the json is a string, that is a Stellar
statement. So you are not passing in a null statement, you are passing in a
Stellar statement that evaluates to null. In this case via the null keyword.
If you wanted to pass a string that said null, you would have to have:
```
,"title" : "'null'"
```
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