Revert "fix: handle invalid values in Decoder's decode method"

This reverts commit 3b918fb.

Author: Skyxim

common/structure/structure.go

@@ -87,11 +87,6 @@ func (d *Decoder) Decode(src map[string]any, dst any) error {
 }
 
 func (d *Decoder) decode(name string, data any, val reflect.Value) error {
-	if !val.IsValid() {
-		// TODO: Why is an invalid value generated?
-		// If an invalid value is passed to `decodeString`, it will panic due to the call to `Type()`.
-		return fmt.Errorf("'%s' is not valid", name)
-	}
 	for {
 		kind := val.Kind()
 		if kind == reflect.Pointer && val.IsNil() {