In vision samples add error check, since the error isn't thrown by default

PR this first came up: #2569

Perform an error check on all sample code for something like this:

error {
  code: 3
  message: "The URL does not appear to be accessible by us. Please double check or download the content and pass it in."
}

Then republish docs

Another interesting note, not all methods have an error, they just return no results.

Methods that have no error:

Methods that will throw an error:

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