More lenient handling of empty Maven modules

[nikita2206]

📜 Description

Maven allows for empty modules to exist, e.g. you can have a Maven module without any Java sources in it.
This is especially common in multi-module projects, where the root module has no sources at all, but only contains children modules; thus the root module does not contain the src/main/java directory.

Our use case

Maven supports inheritance of plugins, that is in multi-module project you can declare a plugin (using <plugins><plugin> .... </plugins>) in the root pom.xml and then this definition will be inherited by all children modules. This would allow us to declare the Sentry plugin only once in the root pom.xml, and have it be inherited in all children.

However, this does not work, because our root pom.xml is an empty module without Java sources, and currently Sentry plugin fails in these circumstances.

💡 Motivation and Context

Allow more convenient use of Sentry plugin in multi-module Maven deployments.

💚 How did you test it?

🔧 Manually tested -> works as expected with a multi-module projects

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[romtsn]

Thanks for your PR, I think this makes sense! @adinauer wdyt?

[adinauer]

Thanks for the PR @nikita2206 I'm still occupied with preparing another release of the Java SDK but am planning to take a look at this PR soon - sorry for the wait.

[nikita2206]

Thank you all!

[adinauer]

LGTM, thanks for the PR