[postprocessor] fix write_debug when no _downloader

diff --git a/youtube_dlc/postprocessor/common.py b/youtube_dlc/postprocessor/common.py
index 7fb85413fc4f37b60cd7f81e709d5e36e8c61646..b641099e6a3eb07ddfca8b385f4a358acc33058d 100644 (file)
--- a/youtube_dlc/postprocessor/common.py
+++ b/youtube_dlc/postprocessor/common.py
@@ -56,7 +56,7 @@ def report_error(self, text, *args, **kwargs):
 
     def write_debug(self, text, prefix=True, *args, **kwargs):
         tag = '[debug] ' if prefix else ''
-        if self.get_param('verbose', False):
+        if self.get_param('verbose', False) and self._downloader:
             return self._downloader.to_screen('%s%s' % (tag, text), *args, **kwargs)
 
     def get_param(self, name, default=None, *args, **kwargs):