修复本地没有hash值不会去加载头像的问题

parts/users.lua

@@ -60,7 +60,7 @@ end
 
 function USERS.getUsername(uid)return db[uid].username end
 function USERS.getMotto(uid)return db[uid].motto end
-function USERS.getHash(uid)return db[uid].hash end
+function USERS.getHash(uid)return db[uid].hash or""end
 function USERS.getAvatar(uid)
 	if uid then
 		if not db[uid].new then