qt update checker: handle --offline
qt update checker: handle --offline

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