Account for null cover images for book addition

More redo todo

parsers/cbz.py

@@ -8,8 +8,6 @@ import collections
 
 class ParseCBZ:
     def __init__(self, filename, temp_dir, file_md5):
-        # TODO
-        # Maybe also include book description
         self.filename = filename
         self.book = None
         self.temp_dir = temp_dir

parsers/epub.py

@@ -48,11 +48,6 @@ class ParseEPUB:
             return None
 
     def get_cover_image(self):
-        # TODO
-        # Generate a cover image in case one isn't found
-        # This has to be done or the database module will
-        # error out
-
         # Get cover image
         # This seems hack-ish, but that's never stopped me before
         image_path = None