fix: various warnings and exceptions

src/renderer/components/WorkspaceTabNewScheduler.vue

@@ -182,7 +182,7 @@ export default {
          return this.getWorkspace(this.connection.uid);
       },
       tabUid () {
-         return this.$vnode.key;
+         return this.$vnode?.key;
       },
       isChanged () {
          return JSON.stringify(this.originalScheduler) !== JSON.stringify(this.localScheduler);