API error "One or more Primary key is required for '${cubeName}' cube" even when `allowUngroupedWithoutPrimaryKey` set to true

**Problem**

I already set `allowUngroupedWithoutPrimaryKey` in `cube.js`, but query with `ungrouped: true` still get error: `"One or more Primary key is required for '${cubeName}' cube"`

In `BaseQuery.js`, i found:
```javascript
/**
*
* @param {string} cubeName
* @returns {Array}
*/
primaryKeyNames(cubeName) {
const primaryKeys = this.cubeEvaluator.primaryKeys[cubeName];
if (!primaryKeys || !primaryKeys.length) {
throw new UserError_1.UserError(`One or more Primary key is required for '${cubeName}' cube`);
}
return primaryKeys.map((pk) => this.primaryKeyName(cubeName, pk));
}
```

`primaryKeyNames` always throws an error when a cube has no primary key. But shouldn’t it check `allowUngroupedWithoutPrimaryKey !== true` first?