AggregatorSourceJarMojo silently does nothing for non-POM packaging

[elharo]

AggregatorSourceJarMojo.java:35-37:

@Override
protected void doExecute() throws MojoException {
    if (Type.POM.equals(getProject().getPackaging().type().id())) {
        packageSources(reactorProjects);
    }
}

If the aggregator project has non-POM packaging, the method returns without any warning or error message. While @Mojo(aggregator = true) typically implies POM packaging, a misleading build or configuration could lead to silent failure — no source JAR is produced and the user receives no indication why.

Fix: Add an else branch with a warning or info message explaining why no sources were packaged.