fix(runtime): check if neighbour exists in nodes.List

maybe fix #242

Author: genofire

runtime/nodes.go

@@ -117,7 +117,7 @@ func (nodes *Nodes) NodeLinks(node *Node) (result []Link) {
 	for sourceMAC, batadv := range neighbours.Batadv {
 		for neighbourMAC, link := range batadv.Neighbours {
 			if neighbourID := nodes.ifaceToNodeID[neighbourMAC]; neighbourID != "" {
-				neighbour := nodes.List[neighbourID]
+				neighbour, neighbourExists := nodes.List[neighbourID]
 
 				link := Link{
 					SourceID:      neighbours.NodeID,
@@ -127,7 +127,7 @@ func (nodes *Nodes) NodeLinks(node *Node) (result []Link) {
 					TQ:            float32(link.TQ) / 255.0,
 				}
 
-				if neighbour.Nodeinfo != nil {
+				if neighbourExists && neighbour.Nodeinfo != nil {
 					link.TargetHostname = neighbour.Nodeinfo.Hostname
 				}
 				if node.Nodeinfo != nil {