From 20cfaef0af467562ec67d9bb3bd721780ec29018 Mon Sep 17 00:00:00 2001
From: KV <kvid@users.noreply.github.com>
Date: Wed, 5 Jun 2024 17:59:41 +0200
Subject: [PATCH] Avoid Graphviz error when hiding all pins (#375)

Fixes #257
---
 src/wireviz/Harness.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index 30468a6a..1ac45341 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -253,6 +253,9 @@ def create_graph(self) -> Graph:
 
                 pinhtml.append("  </table>")
 
+                if len(pinhtml) == 2:  # Table start and end with no rows between?
+                    pinhtml = ["<!-- all pins hidden -->"]  # Avoid Graphviz error
+
                 html = [
                     row.replace("<!-- connector table -->", "\n".join(pinhtml))
                     for row in html