FRANKFURT (Reuters) -Unidentified hackers attempted to trick European Central Bank President Christine Lagarde into letting them open a messaging app account in her name by posing as former German chancellor Angela Merkel, a German source said on Tuesday. The plot was quickly foiled without any information being compromised, an ECB spokesperson said. “We can confirm that there was an attempted cyber incident recently involving the president,” the ECB spokesperson said. “It was identified and halted quickly. No information was compromised. We have nothing more to say as an investigation is ongo…