From 3964021e9781be74db932c3ceacbb40a93c12287 Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Thu, 17 May 2018 14:43:12 -0700
Subject: multi_usrp: Check for existence of mboard sensor names

get_mboard_sensor_names() would crash if a USRP didn't actually have at
least one sensors defined.
---
 host/lib/usrp/multi_usrp.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/host/lib/usrp/multi_usrp.cpp b/host/lib/usrp/multi_usrp.cpp
index 9b61344ef..cdce43055 100644
--- a/host/lib/usrp/multi_usrp.cpp
+++ b/host/lib/usrp/multi_usrp.cpp
@@ -803,7 +803,10 @@ public:
     }
 
     std::vector<std::string> get_mboard_sensor_names(size_t mboard){
-        return _tree->list(mb_root(mboard) / "sensors");
+        if (_tree->exists(mb_root(mboard) / "sensors")) {
+            return _tree->list(mb_root(mboard) / "sensors");
+        }
+        return {};
     }
 
     void set_user_register(const uint8_t addr, const uint32_t data, size_t mboard){
-- 
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