feat(fix):数据集、视图优化

frontend/src/views/chart/group/Group.vue

@@ -807,7 +807,7 @@ export default {
           }
         }
       } else {
-        resolve(node.data.children)
+        node.data.children && resolve(node.data.children)
       }
     },
 

frontend/src/views/dataset/group/Group.vue

@@ -828,7 +828,7 @@ export default {
           }
         }
       } else {
-        resolve(node.data.children)
+        node.data.children && resolve(node.data.children)
       }
     },