code optimization

Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs

@@ -482,11 +482,11 @@ namespace SqlSugar
             if (this.IsSqlQuery && (Skip == null && Take == null))
             {
                 result = System.Text.RegularExpressions.Regex.Match(result, @"^SELECT .* FROM  \(((.|\n|\r)*)\) t  $").Groups[1].Value;
-            }
                 if (string.IsNullOrEmpty(result))
                 {
                     result = old;
                 }
+            }
             return result;
         }
         #endregion