Minimal changes to get WPT tests running on Windows.

servo · bors-servo · Oct 5, 2017 · Jun 19, 2017 · Jun 19, 2017 · Jun 19, 2017
commit c1c60beda19df23631a6b6ff87ef67e17a22e22b
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/wptcommandline.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/wptcommandline.py
@@ -280,8 +280,10 @@ def exe_path(name):
         return
 
     path = find_executable(name)
-    if os.access(path, os.X_OK):
+    if path and os.access(path, os.X_OK):
         return path
+    else:
+        return None
 
 
 def check_args(kwargs):