Emails in mailing list section of pom are improperly handled

The generated file mailing-lists.html contains email names of the form:

<td><a href="test-subscribe@maven.apache.org">Subscribe</a></td>

instead of

<td><a href="mailto:test-subscribe@maven.apache.org">Subscribe</a></td>

Since the protocol is omitted, browsers assume it is the same as the page, i.e. http[s].

Easy to demonstrate:

clone the repo
mvn clean integration-test
examine target/test-harness/mailing-lists/mailing-lists.html

To show that it worked previously, checkout the tag maven-project-info-reports-plugin-2.9
and try the test again.
examine the file target/test-harness/mailing-lists/mail-lists.html

There don't appear to be any tests to check whether the table entries are correctly generated.