[API] If User is Admin, show 500 error message on PROD mode too (#13115)

* API: show admin 500 error message on PROD mode too

* a nit

* dont miss InternalServerError

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

models/migrations/migrations.go

@@ -320,9 +320,9 @@ Please try upgrading to a lower version first (suggested v1.6.4), then upgrade t
 		return nil
 	}
 
-	// Downgraded Gitea not supported
+	// Downgrading Gitea's database version not supported
 	if int(v-minDBVersion) > len(migrations) {
-		msg := fmt.Sprintf("Downgrading Gitea from '%d' to '%d' is not supported and may result in loss of data integrity.\nIf you really know what you're doing, execute `UPDATE version SET version=%d WHERE id=1;`\n",
+		msg := fmt.Sprintf("Downgrading database version from '%d' to '%d' is not supported and may result in loss of data integrity.\nIf you really know what you're doing, execute `UPDATE version SET version=%d WHERE id=1;`\n",
 			v, minDBVersion+len(migrations), minDBVersion+len(migrations))
 		fmt.Fprint(os.Stderr, msg)
 		log.Fatal(msg)

modules/context/api.go

@@ -82,7 +82,7 @@ func (ctx *APIContext) Error(status int, title string, obj interface{}) {
 	if status == http.StatusInternalServerError {
 		log.ErrorWithSkip(1, "%s: %s", title, message)
 
-		if macaron.Env == macaron.PROD {
+		if macaron.Env == macaron.PROD && !(ctx.User != nil && ctx.User.IsAdmin) {
 			message = ""
 		}
 	}
@@ -99,7 +99,7 @@ func (ctx *APIContext) InternalServerError(err error) {
 	log.ErrorWithSkip(1, "InternalServerError: %v", err)
 
 	var message string
-	if macaron.Env != macaron.PROD {
+	if macaron.Env != macaron.PROD || (ctx.User != nil && ctx.User.IsAdmin) {
 		message = err.Error()
 	}