From 22075d6875e913e3f076fa609bf018256a612bb5 Mon Sep 17 00:00:00 2001
From: Chris Dyer <redpony@gmail.com>
Date: Tue, 1 Apr 2014 21:24:11 -0400
Subject: check for empty hg

---
 decoder/tree2string_translator.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/decoder/tree2string_translator.cc b/decoder/tree2string_translator.cc
index 6966ccf8..6f65658e 100644
--- a/decoder/tree2string_translator.cc
+++ b/decoder/tree2string_translator.cc
@@ -214,7 +214,7 @@ struct Tree2StringTranslatorImpl {
     // the following takes care of them
     vector<bool> prune(hg.edges_.size(), false);
     hg.PruneEdges(prune, true);
-
+    if (hg.edges_.size() == 0) return false;
     //hg.PrintGraphviz();
     minus_lm_forest->swap(hg);
     return true;
-- 
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