cosigner pool: show exception text if failing to send to server
cosigner pool: show exception text if failing to send to server

asfin/electrum,spesmilo/electrum,cryptapus/electrum,kyuupichan/electrum,vialectrum/vialectrum,neocogent/electrum,wakiyamap/electrum-mona,neocogent/electrum,pooler/electrum-ltc,spesmilo/electrum,fujicoin/electrum-fjc,cryptapus/electrum,pooler/electrum-ltc,cryptapus/electrum,pooler/electrum-ltc,neocogent/electrum,vialectrum/vialectrum,pooler/electrum-ltc,spesmilo/electrum,wakiyamap/electrum-mona,asfin/electrum,fujicoin/electrum-fjc,wakiyamap/electrum-mona,wakiyamap/electrum-mona,kyuupichan/electrum,vialectrum/vialectrum,asfin/electrum,spesmilo/electrum,kyuupichan/electrum,fujicoin/electrum-fjc