Ignore broken pipe in Element::print() — heartwood

I found the issue reported by spacefrogg in

https://radicle.zulipchat.com/#narrow/channel/369277-heartwood/topic/Terminal.20output.20handling.20and.20pipes/with/574695784

And figured that this might be a low-hanging fruit (at least the exact error they reported), so I went ahead and fixed it with this patch.

I am not yet sure whether this is “the way to go” for the codebase, but well, it is a proposal. Tell me what you think!

     /// Print this element to stdout.
     fn print(&self) {
         use std::io::Write;
         let out = std::io::stdout();
         let mut outlock = out.lock();
         for line in self.render(Constraint::from_env().unwrap_or_default()) {
             println!("{}", line.to_string().trim_end());
             if let Err(error) = writeln!(outlock, "{}", line.to_string().trim_end()) {
                 if error.kind() == std::io::ErrorKind::BrokenPipe {
                     // Ignore broken pipe error and simply return
                     break;
                 } else {
                     panic!("{error}");
                 }
             }
         }
     }