fix: 修复嵌套空条件及表达式全被忽略时生成 NULL 导致 SQL 语义错误的问题

1. 嵌套子条件为空时也应返回对应逻辑类型的单位元(AND为true,OR为false),
   而不是只在根条件生效,否则空子条件会在父级拼接出 NULL,污染整个 WHERE 子句
2. 表达式因 IsIgnoreEmptyParma 被全部过滤后 conditions 为空的情况,
   同样需要按 AND/OR 返回单位元,避免拼出空的表达式列表

condition.go

@@ -108,10 +108,10 @@ func (this Condition) ToSql(m TokenValue) db.Expression {
 		conditions = append(conditions, item.ToSql(m))
 	}
 
-	if this.IsEmpty() {
+	if this.IsEmpty() || len(conditions) == 0 {
-		if this.parent == nil && this.Type() == OR {
+		if this.Type() == OR {
 			return db.V(false)
-		} else if this.parent == nil && this.Type() == AND {
+		} else if this.Type() == AND {
 			return db.V(true)
 		}
 		return nil

go.mod

@@ -13,14 +13,15 @@ require (
 )
 
 require (
+	github.com/DATA-DOG/go-sqlmock v1.5.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-chi/chi/v5 v5.0.12 // indirect
 	github.com/mattn/go-sqlite3 v1.14.42 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/tidwall/gjson v1.17.1 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
-	github.com/tidwall/pretty v1.2.0 // indirect
+	github.com/tidwall/pretty v1.2.1 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect
-	golang.org/x/text v0.25.0 // indirect
+	golang.org/x/text v0.39.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -6,8 +6,7 @@ git.fsdpf.net/go/req v0.0.0-20260820100114-1d95bf64a2a0 h1:HWM1soZb13IIQA69M8Dgy
 git.fsdpf.net/go/req v0.0.0-20260820100114-1d95bf64a2a0/go.mod h1:Lm8WoA8EYs2696rmlxpySoCQY26Qh97cDxVF6NLBfZ8=
 git.fsdpf.net/go/utils v0.0.0-20240509025914-c03a9cb48aff h1:1hokQGKGIstoI7WDBir2N24OGgnussZ3GmucK4TQRuI=
 git.fsdpf.net/go/utils v0.0.0-20240509025914-c03a9cb48aff/go.mod h1:NUoyQtFr905YT+pi850mvSf4YX0WghQIcMQkTvize5o=
-github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
+github.com/DATA-DOG/go-sqlmock v1.5.2 h1:OcvFkGmslmlZibjAjaHm3L//6LiuBgolP7OputlJIzU=
-github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
@@ -43,12 +42,11 @@ github.com/tidwall/gjson v1.17.1 h1:wlYEnwqAHgzmhNUFfw7Xalt2JzQvsMx2Se4PcoFCT/U=
 github.com/tidwall/gjson v1.17.1/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
 github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
 github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
-github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
 github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
 github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
 github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
-golang.org/x/text v0.25.0 h1:qVyWApTSYLk/drJRO5mDlNYskwQznZmkpV2c8q9zls4=
+golang.org/x/text v0.39.0 h1:UbZz4pLOvn600D6Oh6GGEI6VAmndrEBLv8/6BEXzyus=
-golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=