fix: prevent unnecessary error handling in export download endpoint

Adds an early return after handling bad request errors in the GetExportDownload function to avoid unnecessary error processing and improve error handling clarity.

core/controllers/export.go

@@ -68,6 +68,7 @@ func GetExportDownload(c *gin.Context) {
 		exp, err = export.GetJsonService().GetExport(exportId)
 	default:
 		HandleErrorBadRequest(c, errors.New(fmt.Sprintf("invalid export type: %s", exportType)))
+		return
 	}
 	if err != nil {
 		HandleErrorInternalServerError(c, err)