Comment 0 for bug 1617052

Currently, snapcraft suppresses all ImportErrors when attempting to import local plugins (possibly all plugins?) This might be sensible for deep ImportError exceptions, but when first coming up to speed, particularly with local plugins, it's quite common to use the wrong name (as the x-plugin.py format is counter-intuitive) and the inheritance for some of the plugin classes has been finicky in the past. I think it might make sense to not suppress such exceptions if they are happening in shallow stacks (e.g. top-level exceptions).