By Michel Rose and Sabine Siebold PRAGUE (Reuters) – Leaders of 44 European countries gather on Thursday for the inaugural summit of the European Political Community (EPC), a grand show of solidarity for a continent mired in multiple crises, but beyond that it is unclear what the forum is meant to achieve. A brainchild of French President Emmanuel Macron, the EPC brings together the 27 member states of the European Union and 17 other countries, including several waiting to join the bloc and the only one ever to leave it, the United Kingdom. An EU diplomat said the gathering of so many leaders …