 Descriptive stats: unsupported operand type(s) for -: 'NoneType' and 'NoneType
There are 1516 cache records with the following error:
```

unsupported operand type(s) for -: 'NoneType' and 'NoneType'
unsupported operand type(s) for *: 'NoneType' and 'float'
unsupported operand type(s) for *: 'decimal.Decimal' and 'float'"

```
See example https://datasets-server.huggingface.co/statistics?dataset=mozilla-foundation/common_voice_9_0&config=ha&split=validation
See for more details in db:
`{kind:"split-descriptive-statistics", http_status:500, "content.error":/unsupported operand/}`

Related to https://github.com/huggingface/datasets-server/issues/1443
 Descriptive stats: unsupported operand type(s) for -: 'NoneType' and 'NoneType: There are 1516 cache records with the following error:
```

unsupported operand type(s) for -: 'NoneType' and 'NoneType'
unsupported operand type(s) for *: 'NoneType' and 'float'
unsupported operand type(s) for *: 'decimal.Decimal' and 'float'"

```
See example https://datasets-server.huggingface.co/statistics?dataset=mozilla-foundation/common_voice_9_0&config=ha&split=validation
See for more details in db:
`{kind:"split-descriptive-statistics", http_status:500, "content.error":/unsupported operand/}`

Related to https://github.com/huggingface/datasets-server/issues/1443