hw plugins: catch exceptions for custom enumeration functions.
hw plugins: catch exceptions for custom enumeration functions.

related: #4060

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