There is an existing issue for this approach, located on Codehaus JIRA #ARCHETYPE-57, but all instructions listed in this ticket failed for me. Also the blog post of marekdec Ho
I met the same problem with the first answer to this question. Reconfiguring the maven-resources-plugin.
According to this ticket MRESOURCES-36, there should be a <includeEmptyDirs> element, but only for Maven Resources Plugin 2.3.
includeEmptyDirs>
org.apache.maven.plugins maven-resources-plugin 2.3 true