Remove the default console logger when it is not set in the configuration (#602)

* Remove the default console logger when it is not set in the configuration

* Added comment to new function (lint failure)

* update based on PR comments (code style)

* code style fix (thanks bkcsoft)

* check if logger exists based on the l.outputs (like in l.DelLogger) instead of adapter, otherwise panic when reinstalling gitea (since the output adapter still exist, without outputs)

modules/setting/setting.go

@@ -895,6 +895,16 @@ func newLogService() {
 	LogModes = strings.Split(Cfg.Section("log").Key("MODE").MustString("console"), ",")
 	LogConfigs = make([]string, len(LogModes))
 
+	useConsole := false
+	for _, mode := range LogModes {
+		if mode == "console"  {
+			useConsole = true
+		}
+	}
+	if (!useConsole) {
+		log.DelLogger("console")
+	}
+
 	for i, mode := range LogModes {
 		mode = strings.TrimSpace(mode)