fix(postgres): If password or user is empty use empty quotes for connection string, #3985

pkg/services/sqlstore/sqlstore.go

@@ -149,8 +149,13 @@ func getEngine() (*xorm.Engine, error) {
 		if len(fields) > 1 && len(strings.TrimSpace(fields[1])) > 0 {
 			port = fields[1]
 		}
-		cnnstr = fmt.Sprintf("user=%s password=%s host=%s port=%s dbname=%s sslmode=%s",
-			DbCfg.User, DbCfg.Pwd, host, port, DbCfg.Name, DbCfg.SslMode)
+		if DbCfg.Pwd == "" {
+			DbCfg.Pwd = "''"
+		}
+		if DbCfg.User == "" {
+			DbCfg.User = "''"
+		}
+		cnnstr = fmt.Sprintf("user=%s password=%s host=%s port=%s dbname=%s sslmode=%s", DbCfg.User, DbCfg.Pwd, host, port, DbCfg.Name, DbCfg.SslMode)
 	case "sqlite3":
 		if !filepath.IsAbs(DbCfg.Path) {
 			DbCfg.Path = filepath.Join(setting.DataPath, DbCfg.Path)