By RICARDO CASTILLO     The eighth Summit of the Americas (SOA). which concluded Saturday. April 14, in Lima, Peru, was little more than a watered-down exercise in continental power. For starters, the “mini-summit” was unintentionally bombarded by U.S. President Donald Trump by his not attending. Also silently absent from the event was talkative Venezuela President Nicolás Maduro, who was not invited. A face-to-face clash