fixed issues with blank URLs being sent to get_image function when populating...

fixed issues with blank URLs being sent to get_image function when populating show/season/episode images

sickrage/metadata_providers/__init__.py

@@ -770,7 +770,7 @@ class MetadataProvider(object):
 
  @staticmethod
  def get_image(url):
- if url is None:
+ if not url:
  return None
 
  sickrage.app.log.debug("Fetching image from " + url)