错误码的 Starter 的初始化，完成

common/mall-spring-boot-starter-mybatis/src/main/java/cn/iocoder/mall/mybatis/core/dataobject/DeletableDO.java

@@ -31,4 +31,5 @@ public class DeletableDO extends BaseDO {
         this.deleted = deleted;
         return this;
     }
+
 }

common/mall-spring-boot-starter-mybatis/src/main/java/cn/iocoder/mall/mybatis/core/query/QueryWrapperX.java

@@ -44,6 +44,13 @@ public class QueryWrapperX<T> extends QueryWrapper<T> {
         return this;
     }
 
+    public QueryWrapperX<T> gtIfPresent(String column, Object val) {
+        if (val != null) {
+            return (QueryWrapperX<T>) super.gt(column, val);
+        }
+        return this;
+    }
+
     // ========== 重写父类方法，方便链式调用 ==========
 
     @Override