Typos in filters when using array filter

Request:

```
http://localhost:8000/Project?fields=name&q=[["sg_status","is","Active"]]
```

Response:

```
API read() invalid/missing filters string 'logical_operator' (general condition):
{"logical_operator"=>"add",
 "conditions"=>[{"path"=>"sg_status", "relation"=>"is", "values"=>["Active"]}]}
```
