transport: Avoid exception when printing warning after http error #75
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httpDoOnce may return nil for the response in case of errors. This was leading to a nil pointer dereference when trying to log the response. This patch adds a check to avoid accessing the response status code in that case.
A second check is also added on the break condition, when err != nil. This should not be needed with the current httpDoOnce implementation, but is added for safety in case of future changes.