In case the template job is removed the ProxyBuilder keeps going without notifying the end user about the issue.
The builder should fail and report the issue to the user, rather than just hiding the issue.

The problems come from the getProjectBuilders,
if the returned project is null then it should throw an exception to signal that template doesn't exists anymore. And if Case the project type is not handled, it should throw an exception as well indicating the plugin do not support this type of project...