防止误操作出现空单元格出现空值情况

src/controllers/sheetmanage.js

@@ -628,6 +628,10 @@ const sheetmanage = {
                     let r = item.r;
                     let c = item.c;
                     let v = item.v;
+
+                    if(!r || !c) {
+                        continue;
+                    }
     
                     if(r >= data.length){
                         data = datagridgrowth(data, r - data.length + 1, 0);