Applied this change (on top of D25144, D25145, D25146, D25147, D25151, D25152, D25153 and `/project/query/active/` rendered correctly in web browser.
Tested surfing various pages with and without Maniphest's `maniphest.custom-field-definitions`.
If you need some example custom fields, this is an example:
```
[
{
"key": "default",
"name": "Task"
},
{
"key": "bug",
"name": "Bug"
},
{
"key": "log",
"name": "LogSpam"
},
{
"key": "deadline",
"name": "Deadline"
}
]
```