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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