Backport raise errors to 1.4 Stable
Created by: joaolrpaulo
The problem occurs when the identifier service is unreachable and we are passing the :raise_errors option set to false.
The fetch_token method throws NoMethodError while trying to perform the following code:
response.parsed.merge(access_token_opts)
This happens because the response.parsed is nil.
Backported from #460 Closes #459 (closed)