Fix #4683 (If comics.txt is UTF-8 with a byte order mark, the first comic is skipped)

src/calibre/ebooks/comic/input.py

@@ -7,7 +7,7 @@
 Based on ideas from comiclrf created by FangornUK.
 '''
 
-import os, shutil, traceback, textwrap, time
+import os, shutil, traceback, textwrap, time, codecs
 from ctypes import byref
 from Queue import Empty
 
@@ -338,8 +338,9 @@ def get_comics_from_collection(self, stream):
             if not os.path.exists('comics.txt'):
                 raise ValueError('%s is not a valid comic collection'
                         %stream.name)
-            for line in open('comics.txt',
-                    'rb').read().decode('utf-8').splitlines():
+            raw = open('comics.txt', 'rb').read().decode('utf-8')
+            raw.lstrip(unicode(codecs.BOM_UTF8, "utf8" ))
+            for line in raw.splitlines():
                 line = line.strip()
                 if not line:
                     continue