Don't cache empty results

couchpotato/core/plugins/base.py

@@ -216,6 +216,7 @@ class Plugin(object):
                     del kwargs['cache_timeout']
 
                 data = self.urlopen(url, **kwargs)
+                if data:
                     self.setCache(cache_key, data, timeout = cache_timeout)
                 return data
             except: