auto_keep broken by playlist feature
the quick n dirty playlist feature in this commit:
https://github.com/beetbox/beets/commit/861bc69df55cb3d4d20da6082878542ff42d85d8
broken auto_keep:

https://github.com/beetbox/beets/blob/79435c3b6f682d30cac169c97f978491dfd8f80d/beetsplug/convert.py#L204
When auto_keep is true, then this line fails because _get_opts_and_config was modified to return 8 values (+ playlist) instead of 7 and this check wasn't updated.
diff --git a/beetsplug/convert.py b/beetsplug/convert.py
index ef6865597..9b28523c6 100644
--- a/beetsplug/convert.py
+++ b/beetsplug/convert.py
@@ -200,8 +200,8 @@ class ConvertPlugin(BeetsPlugin):
     def auto_convert_keep(self, config, task):
         if self.config['auto_keep']:
             empty_opts = self.commands()[0].parser.get_default_values()
-            (dest, threads, path_formats, fmt,
-             pretend, hardlink, link) = self._get_opts_and_config(empty_opts)
+            (dest, threads, path_formats, fmt, pretend,
+             hardlink, link, playlist) = self._get_opts_and_config(empty_opts)
 
             items = task.imported_items()
             self._parallel_convert(dest, False, path_formats, fmt,
['beetsplug/convert.py']