Ensures there are no orphaned successors to the given {vertex}. @param [DependencyGraph::Vertex] vertex the vertex to fix up. @return [void]
In case we’re building docs in a background process, this method waits for that process to exit (or if it’s already been reaped, or never happened, swallows the Errno::ECHILD error).
Ensures any raised {NoSuchDependencyError} has its {NoSuchDependencyError#required_by} set. @yield