Add sender NULL check in clusterProcessGossipSection invalid_ids case (#12980)
In the following case sender may be unknown, so we need to set up a NULL check for sender: ``` /* If this is a MEET packet from an unknown node, we still process * the gossip section here since we have to trust the sender because * of the message type. */ if (!sender && type == CLUSTERMSG_TYPE_MEET) clusterProcessGossipSection(hdr,link); ```
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