ui: Prevent reset of port-forward rules on cancelling a form (#4981)

* ui: Prevent reset of port-forward rules on cancelling a form

* add check for undefined value

Author: Pearl1594

ui/src/views/network/LoadBalancing.vue

@@ -554,7 +554,7 @@ export default {
         vpcid: this.resource.vpcid
       }).then(json => {
         this.tiers.data = json.listnetworksresponse.network || []
-        this.selectedTier = this.tiers.data && this.tiers.data[0].id ? this.tiers.data[0].id : null
+        this.selectedTier = this.tiers.data?.[0]?.id ? this.tiers.data[0].id : null
         this.$forceUpdate()
       }).catch(error => {
         this.$notifyError(error)

ui/src/views/network/PortForwarding.vue

@@ -503,7 +503,6 @@ export default {
       this.addVmModalNicLoading = false
       this.nics = []
       this.resetTagInputs()
-      this.resetAllRules()
     },
     openTagsModal (id) {
       this.tagsModalLoading = true