custom_fields.items.value in tickets schema missing type or anyOf

[prratek]

I'm running a pipeline from tap-zendesk to the Adswerve variant of target-bigquery and it throws ValueError: ‘type’ or ‘anyOf’ are required fields in property: {} when loading Zendesk tickets.

This appears to be caused by this field in the tickets schema because the target requires that the schema be completely defined. Changing the field to specify a type like this resolves the issue for me:

{
  "value": {
    "type": ["null", "string"]
  }
}

I'd be happy to make a PR if that change sounds good.

[prratek]

Gah, sorry! Closing because this PR does exactly that