From 4e56eceb358ae9e9c25833adbc44b761d321b586 Mon Sep 17 00:00:00 2001
From: Nicolas Bigaouette <nbigaouette@chemcomp.com>
Date: Wed, 12 Nov 2014 09:58:30 -0500
Subject: [PATCH] Detect if "url_data" contains proxy attributes before using
 them.

Fix proposed by @colwilson in issue #555.
---
 linkcheck/cache/robots_txt.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linkcheck/cache/robots_txt.py b/linkcheck/cache/robots_txt.py
index b33c0525..a5c7ab70 100644
--- a/linkcheck/cache/robots_txt.py
+++ b/linkcheck/cache/robots_txt.py
@@ -58,7 +58,7 @@ class RobotsTxt (object):
                 return rp.can_fetch(self.useragent, url_data.url)
             self.misses += 1
         kwargs = dict(auth=url_data.auth, session=url_data.session)
-        if url_data.proxy:
+        if hasattr(url_data, "proxy") and hasattr(url_data, "proxy_type"):
             kwargs["proxies"] = {url_data.proxytype: url_data.proxy}
         rp = robotparser2.RobotFileParser(**kwargs)
         rp.set_url(roboturl)