Fix for encoding guessing of external subtitles without language code under Python 2.7.x.

bazarr/list_subtitles.py

@@ -366,8 +366,14 @@ def guess_external_subtitles(dest_folder, subtitles):
                                   subtitle_path)
                     continue
                 detected_language = None
+
+                if six.PY3:
                     with open(subtitle_path, 'r', errors='ignore') as f:
                         text = f.read()
+                else:
+                    with open(subtitle_path, 'r') as f:
+                        text = f.read()
+
                 try:
                     encoding = UnicodeDammit(text)
                     if six.PY2: