update tests

Database/server.go

@@ -38,14 +38,14 @@ func GetServersList(db *sql.DB) ([]Server, error) {
 	return servers, err
 }
 
-func GetServersbyID(db *sql.DB, id int64) Server {
+func GetServersbyID(db *sql.DB, id int64) (Server, error) {
 	var s Server
 	rows := db.QueryRow("SELECT * FROM dashboard_server WHERE id = ?", id)
 	err := rows.Scan(&s.ID, &s.Hostname, &s.OsId)
 	if err != nil {
-		return Server{}
+		return Server{}, nil
 	}
-	return s
+	return s, err
 }
 
 func GetServersbyOS(db *sql.DB, id int64) ([]Server, error) {