Suricata

Since 7.0.x, we have a change in the behavior of how children nodes in a node tree are parsed.
Earlier, if a child node was empty, it was set to an empty string and all the retriever fns like ConfGetChildValue would check if the strlen of such a node item was 0 and take action accordingly.
However, since 7.0.x, if a child node was empty, it was set to NULL and the retriever fns would segfault on calls like strlen.
This was found while doing backports for https://redmine.openinfosecfoundation.org/issues/6228.