fix: 解决链路图切换时间后接口无数据，界面仍保留之前数据的问题

(cherry picked from commit 82bd184bdd)

src/views/charts2/charts/linkMonitor/LinkDirectionGrid.vue

@@ -73,11 +73,9 @@ export default {
             }
             return a.egressLinkId - b.egressLinkId
           })
-          this.isLinkNoData = linkData.length === 0
-          if (this.isLinkNoData) {
-            return
-          }
 
+          this.isLinkNoData = linkData.length === 0
+          if (!this.isLinkNoData) {
             // 链路流量数据
             const linkGridData = []
             linkData.forEach(d => {
@@ -130,6 +128,7 @@ export default {
             })
 
             this.linkGridData = linkGridData
+          }
         } else {
           this.isLinkNoData = false
           this.isLinkShowError = true
@@ -150,10 +149,7 @@ export default {
           })
 
           this.isNextNoData = nextLinkData.length === 0
-          if (this.isNextNoData) {
+          if (!this.isNextNoData) {
-            return
-          }
-
             // 链路下一跳数据
             const nextGridData = []
 
@@ -222,8 +218,9 @@ export default {
             })
 
             this.nextGridData = nextGridData
+          }
         } else {
-          this.isLinkNoData = false
+          this.isNextNoData = true
           this.isNextShowError = true
           // todo 此时返回的是msg，后期记得改为message
           this.nextErrorMsg = res[1].msg