rsync deployment is successful but exception and traceback result

[neildarlow]

Environment

Python Version: 3.8.2-0ubuntu2

Nikola Version: v8.1.2

Operating System: Linux Mint 20.1 Cinnamon

Description: Performing rsync deployment results in traceback.

Nikola installed as described in Getting Started Guide.
The deployment is successful but I receive the following traceback:

[2021-01-27 15:23:47] INFO: deploy: Successful deployment
Traceback (most recent call last):
File "/home/neil/nikola/lib/python3.8/site-packages/doit/doit_cmd.py", line 190, in run
return command.parse_execute(args)
File "/home/neil/nikola/lib/python3.8/site-packages/doit/cmd_base.py", line 150, in parse_execute
return self.execute(params, args)
File "/home/neil/nikola/lib/python3.8/site-packages/nikola/plugin_categories.py", line 145, in execute
return self._execute(options, args)
File "/home/neil/nikola/lib/python3.8/site-packages/nikola/plugins/command/deploy.py", line 99, in _execute
self._emit_deploy_event(last_deploy, new_deploy, clean, undeployed_posts)
UnboundLocalError: local variable 'clean' referenced before assignment

EDIT: Formatted traceback a little.

[Kwpolska]

Duplicate of #3502, #3500 and #3479. Please search existing issues before creating a new one.

[neildarlow]

Oh my bad. To be fair the default search only searches open bugs and the duplicates have been closed.