bridge: Fix output with empty vlan lists

Consider this configuration:

ip link add br0 type bridge
ip link add vx0 type vxlan dstport 4789 external
ip link set dev vx0 master br0
bridge vlan del vid 1 dev vx0
ip link add vx1 type vxlan dstport 4790 external
ip link set dev vx1 master br0

	root@vsid:/src/iproute2# ./bridge/bridge vlan
	port    vlan-id
	br0      1 PVID Egress Untagged

	vx0     None
	vx1      1 PVID Egress Untagged

	root@vsid:/src/iproute2#

Note the useless and inconsistent empty lines.

	root@vsid:/src/iproute2# ./bridge/bridge vlan tunnelshow
	port    vlan-id tunnel-id
	br0
	vx0     None
	vx1

What's the difference between "None" and ""?

	root@vsid:/src/iproute2# ./bridge/bridge -j -p vlan tunnelshow
	[ {
		"ifname": "br0",
		"tunnels": [ ]
	    },{
		"ifname": "vx1",
		"tunnels": [ ]
	    } ]

Why does vx0 appear in normal output and not json output?
Why output an empty list for br0 and vx1?

Fix these inconsistencies and avoid outputting entries with no values. This
makes the behavior consistent with other iproute2 commands, for example
`ip -6 addr`: if an interface doesn't have any ipv6 addresses, it is not
part of the listing.

Fixes: 8652eeb3ab12 ("bridge: vlan: support for per vlan tunnel info")
Signed-off-by: Benjamin Poirier <bpoirier@cumulusnetworks.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

0 files changed, 0 insertions, 0 deletions