[tagesschau] Remove unused import

youtube_dl/extractor/tagesschau.py

@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 import re
 
 from .common import InfoExtractor
-from ..utils import parse_filesize, ExtractorError
+from ..utils import parse_filesize
 
 
 class TagesschauIE(InfoExtractor):