Lost error message and exception

When a Couchbase operation fails, we may not get the error message and exception (at least for the kind of error I have).
Those error details are produced properly, but then overwriten and erased by the MemcachedNode.ExecuteOperation implementation.

When Acquire fails, "readResult.Combine(result);" overwrites this result with the values of "readResult", which in this block is always blank.

Dropping it just gave me back the error I was looking for.