Only call the delegate with userBuf if it is not nil #57
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Without this check if a pushPullMsg is sent with a UserStateLen of 0, userBuf is nill and passed to the delegates. Issue over in serf: hashicorp/serf#339
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Only call the delegate with userBuf if it is not nil
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Without this check if a pushPullMsg is sent with a UserStateLen of 0, userBuf is nill and passed to the delegates.
Issue over in serf: hashicorp/serf#339