fix: render error when row element is empty #420

src/editor/core/draw/Draw.ts

@@ -1833,7 +1833,7 @@ export class Draw {
     // 控件高亮
     this.control.renderHighlightList(ctx, pageNo)
     // 渲染元素
-    const index = rowList[0].startIndex
+    const index = rowList[0]?.startIndex
     this.drawRow(ctx, {
       elementList,
       positionList,

src/editor/core/position/Position.ts

@@ -229,7 +229,7 @@ export class Position {
     let startRowIndex = 0
     for (let i = 0; i < pageRowList.length; i++) {
       const rowList = pageRowList[i]
-      const startIndex = rowList[0].startIndex
+      const startIndex = rowList[0]?.startIndex
       this.computePageRowPosition({
         positionList: this.positionList,
         rowList,