Is your feature request related to a problem? Please describe.

In case of a valid but empty json credential, the error message is not really easy to read. For instance, if I use an option like this

option.WithCredentialsJSON([]byte({})

until cloud.google.com/go/[email protected] it returns an error message like this:

storage.NewClient(ctx): dialing: missing 'type' field in credentials

however, newer versions return an error message like this:

storage.NewClient(ctx): dialing: credentials: unsupported filetype '\x00'

what is this byte 00 ? unclear

Describe the solution you'd like

A better error message