Requests that fail aren't propagating errors

[bolivier]

I was working with a subscription and the response came back with an error. Nothing checked for the error, so when a value was nil that shouldn't have been, my call returned a runtime error. That was difficult to track down. Perhaps this isn't different enough from #8 to warrant a new issue, but it's related. This is the line that is liberally catching the errors.

[grokify]

The error should be handled by notify_observers(e) and raise. Is the situation that your observer isn't expecting the error? The code could be updated such that observers aren't sent the error and thus only need to handle the successful situation.

        rescue StandardError => e
          reset
          changed
          notify_observers(e)
          raise 'Subscribe HTTP Request Error: ' + e.to_s
        end

https://github.com/bolivier/ringcentral-sdk-ruby/blob/master/lib/ringcentral_sdk/rest/subscription.rb#L85-L89