[MSOURCES-150] Skip creation of sources jar when sources are empty

[jira-importer]

Peter De Maeyer opened MSOURCES-150 and commented

The maven-jar-plugin can be configured with skipIfEmpty to skip the creation of a jar when the main sources are empty. This is useful for example when a project only has test sources.

However, even if the sources are empty, the maven-source-plugin always creates a sources jar, even if there is no jar.

For symmetry reasons, it would therefore be useful if the maven-source-plugin also had an option skipIfEmpty.

Also consider the same for test sources. Although it seems that for test sources it already works like this by default.

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Affects: 3.3.0