From ad356e3239635db5304fd81bda6ffca94634666f Mon Sep 17 00:00:00 2001
From: berak <px1704@web.de>
Date: Wed, 24 Oct 2018 12:37:01 +0200
Subject: [PATCH] dnn/samples: handle not set env vars gracefully

---
 samples/dnn/common.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/samples/dnn/common.hpp b/samples/dnn/common.hpp
index a0ca012645..fce7f9fbb9 100644
--- a/samples/dnn/common.hpp
+++ b/samples/dnn/common.hpp
@@ -58,10 +58,12 @@ std::string findFile(const std::string& filename)
     if (filename.empty() || utils::fs::exists(filename))
         return filename;
 
-    std::string extraPaths[] = {getenv("OPENCV_DNN_TEST_DATA_PATH"),
+    const char* extraPaths[] = {getenv("OPENCV_DNN_TEST_DATA_PATH"),
                                 getenv("OPENCV_TEST_DATA_PATH")};
     for (int i = 0; i < 2; ++i)
     {
+        if (extraPaths[i] == NULL)
+            continue;
         std::string absPath = utils::fs::join(extraPaths[i], utils::fs::join("dnn", filename));
         if (utils::fs::exists(absPath))
             return absPath;