Do not continue to show 'Importing 0' progress bar if blocklist fails to

import.

deluge/plugins/blocklist/blocklist/core.py

@@ -164,6 +164,7 @@ class Core(CorePluginBase):
             read_list = FORMATS[self.config["listtype"]][1](bl_file)
         except Exception, e:
             log.debug("Unable to read blocklist file: %s", e)
+            self.is_importing = False
             return
 
         try: