Function render_dot_all_partial 

pub fn render_dot_all_partial(
    dot_source: &str,
    engine: &str,
    format: &str,
    globals: &GlobalAttrs,
    options: LayoutOptions,
) -> (Vec<String>, Option<GraphvizError>)

render_dot_all_with_options that renders the graphs read before a syntax error and returns that error alongside, as dot does.