From d25d884596fa546dd0b85feec0a7acb485cc1997 Mon Sep 17 00:00:00 2001
From: Aaron Xiao <xiaoxiangquan@gmail.com>
Date: Sat, 16 Sep 2017 11:44:55 +0800
Subject: [PATCH] HDMap: Fallback to a default map path if none candidates
 exist.

---
 modules/map/hdmap/hdmap_util.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/modules/map/hdmap/hdmap_util.cc b/modules/map/hdmap/hdmap_util.cc
index c2102bad68..45984f7942 100644
--- a/modules/map/hdmap/hdmap_util.cc
+++ b/modules/map/hdmap/hdmap_util.cc
@@ -33,8 +33,10 @@ std::string FindFirstExist(const std::string& dir, const std::string& files) {
       return file_path;
     }
   }
-  AERROR << "No existing file found in " << dir << "/" << files;
-  return "";
+  AERROR << "No existing file found in " << dir << "/" << files << ". "
+            "Fallback to first candidate as default result.";
+  CHECK(!candidates.empty()) << "Please specify at least one map.";
+  return apollo::common::util::StrCat(FLAGS_map_dir, "/", candidates[0]);
 }
 
 }  // namespace
-- 
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