Make sure RetryMiddleware logs ASCII-only exception strings in Python 2. Fixes scrapyGH-1330.

Author: kmike

scrapy/downloadermiddlewares/retry.py

@@ -60,9 +60,11 @@ def process_response(self, request, response, spider):
         return response
 
     def process_exception(self, request, exception, spider):
-        if isinstance(exception, self.EXCEPTIONS_TO_RETRY) \
-                and not request.meta.get('dont_retry', False):
-             return self._retry(request, exception, spider)
+        if not isinstance(exception, self.EXCEPTIONS_TO_RETRY):
+            return
+        if request.meta.get('dont_retry', False):
+            return
+        return self._retry(request, repr(exception), spider)
 
     def _retry(self, request, reason, spider):
         retries = request.meta.get('retry_times', 0) + 1