packaging: check in make_tgz if packages folder exists
packaging: check in make_tgz if packages folder exists

related: #4714

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