catch ValueError before ImportError
fixes #2385 

I didn't increment the job runner version, because it only happen in 235 datasets. We will update them manually.

```
db.cachedResponsesBlue.countDocuments({error_code: "DatasetWithScriptNotSupportedError", kind: "dataset-config-names"})
235
```
catch ValueError before ImportError: fixes #2385 

I didn't increment the job runner version, because it only happen in 235 datasets. We will update them manually.

```
db.cachedResponsesBlue.countDocuments({error_code: "DatasetWithScriptNotSupportedError", kind: "dataset-config-names"})
235
```