fix errors

Signed-off-by: Roman <ixrock@gmail.com>

src/renderer/_vue/mixins/ClustersMixin.js

@@ -1,14 +1,14 @@
 export default {
   computed: {
-    clusters: function() {
+    clusters: function () {
       return this.$store.getters.clusters
     },
-    newContexts: function() {
-      const seenContexts = this.seenContexts || this.$store.getters.seenContexts
+    newContexts: function () {
+      const seenContexts = this.seenContexts ? Array.from(this.seenContexts) : this.$store.getters.seenContexts
       const contextNamesFromKubeconfig = this.availableContexts.map(item => item.currentContext)
       return contextNamesFromKubeconfig.filter((item) => seenContexts.indexOf(item) < 0)
     },
-    availableContexts: function() {
+    availableContexts: function () {
       // read available kubeconfigs from store on filter out configs already found in added clusters
       return this.$store.getters.availableKubeContexts.filter(item => !this.clusters.find((cluster) => cluster.contextName == item.currentContext));
     },

src/renderer/_vue/store/modules/kube-contexts.js

@@ -7,6 +7,7 @@ const state = {
 
 const actions = {
   reloadAvailableKubeContexts({commit}, file) {
+    if(!file) return;
     let kc = new k8s.KubeConfig();
     try {
       kc.loadFromFile(file);