JSONRPCServer: Catch and return UTF-8 decode errors
JSONRPCServer: Catch and return UTF-8 decode errors

thrasher-/eloipool,uingei/eloipool,imsaguy/eloipool,cinnamoncoin/eloipool-1,wizkid057/eloipool,thrasher-/eloipool,thrasher-/eloipool,svasva/eloipool,ahmedbodi/SHA-Eloipool-MMCFE-,jameshilliard/4tar-eloipool,uingei/eloi,pointgaming/point-gaming-btc