REPORT-45880 使用富文本恢复普通文本后文本格式失效

designer-realize/src/main/java/com/fr/grid/selection/CellSelection.java

@@ -592,10 +592,12 @@ public class CellSelection extends Selection {
     //设置显示内容为default
     private void setDefault(CellElement element) {
         CellGUIAttr cellGUIAttr = element.getCellGUIAttr();
-        cellGUIAttr.setShowAsDefault(true);
+        if (cellGUIAttr != null) {
-        cellGUIAttr.setShowAsHTML(false);
+            cellGUIAttr.setShowAsDefault(true);
-        cellGUIAttr.setShowAsDownload(false);
+            cellGUIAttr.setShowAsHTML(false);
-        cellGUIAttr.setShowAsImage(false);
+            cellGUIAttr.setShowAsDownload(false);
+            cellGUIAttr.setShowAsImage(false);
+        }
     }