Receiving of osc bundles is broken

[depili]

Adding the following test-case

func TestReadBundle(t *testing.T) {
	b := NewBundle(time.Now())
	b.Append(NewMessage("/a", "test"))
	b.Append(NewMessage("/b", "test2"))

	d, err := b.MarshalBinary()
	if err != nil {
		t.Errorf("bundle marshal error: %v", err)
		return
	}

	d = append(d, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)

	io := bufio.NewReader(bytes.NewReader(d))
	start := 0
	bundle, err := readBundle(io, &start, len(d))
	if err != nil {
		t.Errorf("bundle read error: %v", err)
		return
	}

	if len(bundle.Messages) != 2 {
		t.Error("incorrect message count on decode")
		return
	}
}

resultst in:

--- FAIL: TestReadBundle (0.00s)
    osc_test.go:302: bundle read error: unsupported OSC packet type: only Bundle and Message are supported

During the decoding of osc bundles the appending of messages to the bundle fails.

[depili]

Hitting this same error on a real world use case. Underlying issue might be that the bundle decoding doesn't terminate as it should.

[depili]

Root cause seems to be readPacket() returning empty Packet instances when the parsing hits null padding bytes in a message and then trying to append them to Bundle

[depili]

And the readBundle() function parses the length data for each bundle item during it's decoding process, but doesn't use that information for anything.