tableHeader 容错处理

src/Table.js

@@ -170,6 +170,11 @@ class Table extends Component {
     if (this.columnManager.isAnyColumnsFixed()) {
       this.syncFixedTableRowHeight();
     }
+    //如果contentDomWidth为0则需要重新计算，适应模态框中表格;
+    if(this.contentDomWidth == 0){
+      this.computeTableWidth();
+    }
+
   }
 
   componentWillUnmount() {

src/TableHeader.js

@@ -37,7 +37,7 @@ class TableHeader extends Component {
     // let a = this.props.rows[0];
 
     let _row = [];
-    this.props.rows[0].forEach(item => {
+    this.props.rows[0] && this.props.rows[0].forEach(item => {
       let newItem = item.key != "checkbox" ? ObjectAssign(item) : item;
       _row.push(newItem);
     });