delete blank line

middleware/auth/auth.go

 				if expired == 0 && tokenFromCookie == "" {
 					if session.DeleteJwtToken(token.Raw) {
 						ctx.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"msg": "auth failed, token expired"})
-
 					} else {
 						ctx.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"msg": "auth failed, delete server token failed"})
 					}