Fixes #20221: JSON CustomField does not coerce {} to null
#20276
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This fix actually fixes this for all valid JSON values that evaluate to
`False` in Python when loaded and cast to bool:
`bool(json.loads(<val>))`.
- `{}`
- `[]`
- `0`
- `False`
This does not change the behavior of `()` or `""` which are both
explicitly cited as "empty" values on `JSONField`.
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Fixes: #20221
This fix actually fixes this for all valid JSON values that evaluate to
Falsein Python when loaded and cast to bool:bool(json.loads(<val>)).{}[]0FalseThis does not change the behavior of
()or""which are both explicitly cited as "empty" values onJSONField.