message: fix(ui): allow to omit endpoint in multi channel associations
diff: @@ -1238,8 +1238,8 @@ export default {
  var association = { nodeId: target }
  - if (g.group.multiChannel) {
  - association.endpoint = g.targetInstance || 0
  + if (g.group.multiChannel && g.targetInstance >= 0) {
  + association.endpoint = g.targetInstance
  }
  if (g && g.node && target) {
  @@ -1258,8 +1258,8 @@ export default {
  if (g && g.node && target) {
  var association = { nodeId: target }
  - if (g.group.multiChannel) {
  - association.endpoint = g.targetInstance || 0
  + if (g.group.multiChannel && g.targetInstance >= 0) {
  + association.endpoint = g.targetInstance
  }
  var args = [g.node.id, g.group.value, [association]]
  