Error handling for Custom Column with web.contents(API), fails when returns error 404

I have a long list of company VAT numbers, then i create a new custom column with formula:

Csv.Document(Web.Contents("https://blahblahblah/" & [CustomerVAT]))

It shows data for many company VAT's but in some instances it throws a 404 error, and then the entire query fails with error 

DataSource.Error: Web.Contents failed to get contents from https://blahblahblah/ (404)