优化表格健壮性

src/packages/hs-table/src/child.vue

@@ -102,7 +102,10 @@
               :sortable="columnItem.isSort?'custom':false"
             >
               <template v-slot:header>
-                    <span v-if="columnItem.isRequired"  :class="{'is-isRequired': columnItem.isRequired}">
+                <span
+                  v-if="columnItem.isRequired"
+                  :class="{'is-isRequired': columnItem.isRequired}"
+                >
                   *
                 </span>
                 <span>{{ columnItem.label }}</span>
@@ -237,7 +240,10 @@
               :sortable="column.isSort"
             >
               <template v-slot:header>
-                    <span v-if="column.isRequired"  :class="{'is-isRequired': column.isRequired}">
+                <span
+                  v-if="column.isRequired"
+                  :class="{'is-isRequired': column.isRequired}"
+                >
                   *
                 </span>
                 <span>{{ column.label }}</span>
@@ -396,7 +402,7 @@ export default {
     },
     // 第一行数据
     firstRow() {
-      return (this.data.length && this.data[0]) || {}
+      return (this.data && this.data.length && this.data[0]) || {}
     },
     // 表格真实显示数据
     tableData() {
@@ -1083,7 +1089,7 @@ export default {
 td {
   height: 35px !important;
 }
-.is-isRequired{
+.is-isRequired {
   color: red;
 }
 </style>