problem with sharding

[rdonmez1]

Hello,

if "queueitems" collection has a shard key, It occurs an error in the OldesUnfetchedItem() method like that;

MongoError: exception: query for sharded findAndModify must have shardkey

fyi.

[tad-lispy]

Hello, @rdonmez. Thanks for rising this issue. To be frank I most likely won't have time to maintain this project in near future. Sorry about that.