A French television star and a group of investors are demanding 280 million Swiss francs ($330 million) from Nespresso after the failure of a company that tried to offer a more sustainable alternative to the aluminium capsules sold by the coffee-pod maker.The suit groups 11 creditors of Ethical Coffee Company (ECC), which was founded in 2008 by a former Nespresso executive to make cheaper biodegradable capsules that were compatible with Nespresso machines.