[extractor/niconicochannelplus] add sanity check for "--extractor-args"

Co-authored-by: bashonly <88596187+bashonly@users.noreply.github.com>

yt_dlp/extractor/niconicochannelplus.py

@@ -167,7 +167,7 @@ class NiconicoChannelPlusIE(NiconicoChannelPlusBaseIE):
             headers={'Content-Type': 'application/json'},
             query={
                 'sort_direction': 'asc',
-                'limit': traverse_obj(self._configuration_arg('max_comments', [120]), (0, )),
+                'limit': int_or_none(self._configuration_arg('max_comments', [''])[0]) or 120,
             },
             data=json.dumps({
                 'token': comment_access_token,
@@ -217,7 +217,7 @@ class NiconicoChannelPlusIE(NiconicoChannelPlusBaseIE):
             raise ExtractorError(f'Unknown type: {video_type}', video_id=content_code, expected=False)
 
         # help us to analyze when error occurs
-        self.to_screen(f'{content_code}: video_type={video_type}, live_status={live_status}')
+        self.write_debug(f'{content_code}: video_type={video_type}, live_status={live_status}')
 
         session_id = self._call_api(
             f'video_pages/{content_code}/session_ids', item_id=f'{content_code}/session',