Null value in column "sqls" of relation "metric" violates not-null constraint

Hello,

**Describe the bug**

When adding a metric from the UI, I get the following message in the red alert box:

```
SQLs

ERROR: null value in column "sqls" of relation "metric" violates not-null constraint (SQLSTATE 23502) 
```

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Metrics'
2. Click on 'New+'
3. Add a metric with only the name and sqls'
4. See error

Robin,