Improve black hole support

Also scan the 'from' folder if Black hole is used together with another
downloader.

couchpotato/core/downloaders/blackhole/main.py

@@ -51,10 +51,10 @@ class Blackhole(Downloader):
                         with open(full_path, 'wb') as f:
                             f.write(filedata)
                         os.chmod(full_path, Env.getPermission('file'))
-                        return True
+                        return self.downloadReturnId('')
                     else:
                         log.info('File %s already exists.', full_path)
-                        return True
+                        return self.downloadReturnId('')
 
                 except:
                     log.error('Failed to download to blackhole %s', traceback.format_exc())

couchpotato/core/plugins/renamer/main.py

@@ -827,6 +827,11 @@ Remove it if you want it to be renamed (again, or at least let it try again)
                             fireEvent('release.update_status', rel.id, status = ignored_status, single = True)
                             continue
 
+                        if not rel_dict['info'].get('download_id'):
+                            log.debug('Download status functionality is not implemented for downloader (%s) of release %s.', (rel_dict['info'].get('download_downloader', 'unknown'), rel_dict['info']['name']))
+                            scan_required = True
+                            continue
+
                         # check status
                         nzbname = self.createNzbName(rel_dict['info'], movie_dict)