LONDON (Reuters) - James Dyson, the inventor of the bagless vacuum cleaner, has cancelled his ambitious plan to build an electric car because the project was not commercially viable.Dyson said his engineers had built a "fantastic car" and that the project was not being closed due to any failures in research and development."However, though we have tried very hard throughout the development process, we simply can no longer see a way to make it commercially viable," he told staff on Thursday. The..