Backport to 4.0.x - Null Java EE Web Project Archetype

The project wizards in JBoss central are based on Maven archetypes and stacks.yml holds information defining the archetype for each project. Occasionally, stacks.yml would not load correctly and archetype information necessary for building the project would not be available. As a result, the wizard description would show "Project based on the null:null:null Maven archetype" and the project would fail to be created, with the error "Root cause: For artifact null:null:null:pom". The tooling has been modified to ensure stack.yml is always correctly loaded. Consequently, the wizard does not show null in the Maven archetype information and the project is successfully created.