interface.is_server_ca_signed: don't rely on assert
interface.is_server_ca_signed: don't rely on assert

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