added empty query checks

filter.go

@@ -101,11 +101,12 @@ func NewQuery(s string) (q *Query, err error) {
 		return
 	}
 	qm := make(map[string]struct{})
-	fields := strings.Split(s, " ")
+	fields := clearFields(s)
+	if len(fields) == 0 {
+		err = errors.New("query is empty")
+		return
+	}
 	for _, v := range fields {
-		if v == "" {
-			continue
-		}
 		if q.l == undefined {
 			l, ok := parseLogic(v)
 			q.l = l
@@ -160,8 +161,10 @@ func NewQuery(s string) (q *Query, err error) {
 			boolFunc(m[1]),
 		})
 	}
-	if len(q.m) == 0 {
+	if len(q.m) == 0 && q.s.enabled {
 		q.s.only = true
+	} else if len(q.m) == 0 {
+		err = errors.New("query is empty")
 	}
 	if len(q.m) == 1 && q.l != not {
 		q.l = or