fix(测试跟踪): 功能用例列表多选字段处理导致样式问题

--bug=1018360 --user=宋昌昌 【测试跟踪】用例列表样式错乱，刷新浏览器或重新登录都无法恢复 https://www.tapd.cn/55049933/s/1266854

Co-authored-by: song-cc-rock <changchang.song@fit2cloud.com>

framework/sdk-parent/frontend/src/utils/tableUtils.js

@@ -466,6 +466,7 @@ export function getCustomFieldValue(row, field, members) {
           }
         } else if (field.type === 'multipleMember') {
           let values = '';
+          if (item.value.length > 0) {
             item.value.forEach(v => {
               for (let j = 0; j < members.length; j++) {
                 let member = members[j];
@@ -476,6 +477,7 @@ export function getCustomFieldValue(row, field, members) {
                 }
               }
             });
+          }
           return values;
         } else if (['radio', 'select'].indexOf(field.type) > -1) {
           if (field.options) {