调整：仿真管理地图列表页调整

src/views/demonstration/list/demonList.vue

@@ -103,9 +103,8 @@
                         });
 
                     }
-
                     this.$nextTick(() => {
-                        let mapId = getSessionStorage('demonList') || this.treeList[0].id;
+                        let mapId = getSessionStorage('demonList') || (this.treeList[0] || { id: 0 }).id;
                         this.$router.push({ path: `${UrlConfig.demonstration.detail}/${mapId}` });
                         this.$refs.tree.setCurrentKey(mapId);
                         this.loading = false;