修复维护项目图片标志字段处理逻辑

src/views/modules/eam/eamMaintenanceItem.vue

@@ -883,7 +883,7 @@
           itemRemark: row.itemRemark,
           itemType: 'B',
           updateBy: this.$store.state.user.name,
-          imageFlag: row.imageFlag,
+          imageFlag: row.imageFlag === 'Y' ? 'Y' : '',
           checkType: row.checkType
         }
         this.modalDisableFlag = true
@@ -954,7 +954,8 @@
             s += obj[i].value + ','
           }
         }
-        s = s.substring(0,s.length-1)
+        // 处理复选框值：勾选为Y，未勾选为空字符串或N时转为空字符串
+        s = s.length > 0 ? s.substring(0, s.length - 1) : ''
         this.modalData.imageFlag = s
         if(this.modalData.flag === '1'){
           eamPropertiesItemSave(this.modalData).then(({data}) => {