fix: write wrong type of metadata (#17605)

internal/handler/document.go

@@ -577,9 +577,6 @@ func (h *DocumentHandler) ListDocuments(c *gin.Context) {
 		return
 	}
 
-	// Mirror Python: an explicit id/name filter that matches nothing is an
-	// ownership error rather than an empty page. Each filter's existence is
-	// checked independently of the other.
 	if docID := c.Query("id"); docID != "" {
 		idOpts := opts
 		idOpts.DocIDs = []string{docID}