qt history: data() should return QVariant
qt history: data() should return QVariant

the docs says so,
and also HistoryList.create_menu() was crashing sometimes re "Copy {}"

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