Merge pull request #29416 from aboch/c1.12.x

[1.12.5] Fix buildIpamResources()
diff --git a/api/server/router/network/network_routes.go b/api/server/router/network/network_routes.go
index 2688376..8981202 100644
--- a/api/server/router/network/network_routes.go
+++ b/api/server/router/network/network_routes.go
@@ -264,6 +264,9 @@
 
 	if !hasIpv6Conf {
 		for _, ip6Info := range ipv6Info {
+			if ip6Info.IPAMData.Pool == nil {
+				continue
+			}
 			iData := network.IPAMConfig{}
 			iData.Subnet = ip6Info.IPAMData.Pool.String()
 			iData.Gateway = ip6Info.IPAMData.Gateway.String()