From 3e151846ca30d8249d72530669bca03d0be3f731 Mon Sep 17 00:00:00 2001
From: Varun Agrawal <varagrawal@gmail.com>
Date: Mon, 10 Oct 2022 14:55:02 -0400
Subject: [PATCH] slight improvement to GaussianMixtureFactor print

---
 gtsam/hybrid/GaussianMixtureFactor.cpp | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/gtsam/hybrid/GaussianMixtureFactor.cpp b/gtsam/hybrid/GaussianMixtureFactor.cpp
index 9b5be188a..181b1e6a5 100644
--- a/gtsam/hybrid/GaussianMixtureFactor.cpp
+++ b/gtsam/hybrid/GaussianMixtureFactor.cpp
@@ -57,11 +57,12 @@ void GaussianMixtureFactor::print(const std::string &s,
       [&](const GaussianFactor::shared_ptr &gf) -> std::string {
         RedirectCout rd;
         std::cout << ":\n";
-        if (gf)
+        if (gf && !gf->empty()) {
           gf->print("", formatter);
-        else
-          return {"nullptr"};
-        return rd.str();
+          return rd.str();
+        } else {
+          return "nullptr";
+        }
       });
   std::cout << "}" << std::endl;
 }