Because of this check, if a JSON with a property `target` was saved it
would become malformed.
For example trying to save a JSON field:
```json
{
"target": {
"value": {
"foo": "bar"
}
}
}
```
would result in:
```json
{
"foo": "bar"
}
```
And trying to save:
```json
{
"target": "foo"
}
```
would just not save anything:
```json
null
```
I went through all of the field types and did not find a single one that
would rely on this ternary. Seems like it always defaulted to `const val
= e`, except the unexpected case described previously.
Fixes#12873
Added test may be overkill, will remove if so.
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---------
Co-authored-by: Jacob Fletcher <jacobsfletch@gmail.com>
c03e9c1724