There is a stable pattern on this site when an article doesn't have a cover, there is an <img> element with an empty "src" parameter.

Such articles should be supported.

Examples are abundant:
www.coinspeaker.com/announcing-the-launch-of-the-ifx-expo-asia-2019/
www.coinspeaker.com/coinbase-takes-ripplelabs-coin-their-custodian-services/
www.coinspeaker.com/ruby-x-a-whole-new-level-of-an-integrated-trading-platform-launches-the-first-and-the-last-public-sale-for-ruby-tokens/
www.coinspeaker.com/genesis-global-trading-receives-5th-ever-bitlicense-ny/
www.coinspeaker.com/iot-ready-alliance-introduces-first-iot-ready-interface-specification-v1-0/
www.coinspeaker.com/back-bitcoin-not-blockchain-world-says-lightning-labs-ceo/
www.coinspeaker.com/spanish-bank-bbva-issues-first-kind-corporate-loan-blockchain/
www.coinspeaker.com/20-large-financial-institutions-getting-ready-trade-crypto%d1%81urrencies-2018/
www.coinspeaker.com/6-trillion-sent-across-bitcoin-network/