fix(测试跟踪): 模块树前端控制台报错问题

--bug=1033906 --user=宋昌昌 【测试跟踪】点击功能测试tab页，前端会有报错 https://www.tapd.cn/55049933/s/1447450

test-track/frontend/src/business/module/TestCaseNodeTree.vue

@@ -247,7 +247,7 @@ export default {
       }
     },
     justSetCurrentKey() {
-      if (this.$refs.nodeTree) {
+      if (this.$refs.nodeTree && this.currentNode.data) {
         this.$refs.nodeTree.justSetCurrentKey(this.currentNode.data.id)
       }
     },

test-track/frontend/src/business/module/TestCaseReviewNodeTree.vue

@@ -132,7 +132,7 @@ export default {
       this.$emit("nodeSelectEvent", node, node.data.id === 'root' ? [] : nodeIds, pNodes);
     },
     justSetCurrentKey() {
-      if (this.$refs.nodeTree) {
+      if (this.$refs.nodeTree && this.currentNode.data) {
         this.$refs.nodeTree.justSetCurrentKey(this.currentNode.data.id)
       }
     },

test-track/frontend/src/business/module/TestPlanNodeTree.vue

@@ -132,7 +132,7 @@ export default {
       this.$emit("nodeSelectEvent", node, node.data.id === 'root' ? [] : nodeIds, pNodes);
     },
     justSetCurrentKey() {
-      if (this.$refs.nodeTree) {
+      if (this.$refs.nodeTree && this.currentNode.data) {
         this.$refs.nodeTree.justSetCurrentKey(this.currentNode.data.id)
       }
     },