[EconomistBridge] fix: broken bridge
[EconomistBridge] fix: broken bridge

Fixes: Call to a member function find() on boo

The new-style articles had their DOM changed.

kranack/rss-bridge,ORelio/rss-bridge,Riduidel/rss-bridge,RSS-Bridge/rss-bridge,kranack/rss-bridge,ORelio/rss-bridge,Riduidel/rss-bridge,kranack/rss-bridge,Riduidel/rss-bridge,kranack/rss-bridge,ORelio/rss-bridge,RSS-Bridge/rss-bridge,RSS-Bridge/rss-bridge