Description
The UpdateReadmeMojo fails with NPE when executed outside the camel tree, as example when running for the camel-k specific components.
This is because there's no check on the presence of the camel-core directory here https://github.com/apache/camel/blob/master/tooling/maven/camel-package-maven-plugin/src/main/java/org/apache/camel/maven/packaging/UpdateReadmeMojo.java#L207