Removed check made obsolete by new behavior of art_file and cover_file

Author: E.S. Rosenberg a.k.a. Keeper of the Keys

src/gpodder/coverart.py

@@ -61,9 +61,6 @@ def get_cover(self, podcast, download=False, episode=None):
         password = podcast.auth_password
 
         # Return already existing files
-        if os.path.exists(filename):
-            return filename
-
         for extension in self.EXTENSIONS:
             if os.path.exists(filename + extension):
                 return filename + extension