Uninitialized local variable 'clean' in plugins/command/deploy.py produces a warning upon deployment

[mkkhg]

Environment

Python Version:
3.8.5

Nikola Version:
v8.1.2

Operating System:
Ubuntu 20 LTS, WSL 2

Description:

A small bug - local variable 'clean' in plugins/command/deploy.py is not initialized explicitly, thus produces a warning upon deployment:

[2021-01-13 19:40:14] INFO: deploy: => preset 'default'
[2021-01-13 19:40:14] INFO: deploy: ==> rsync ...
sending incremental file list

sent 3,180 bytes received 27 bytes 1,282.80 bytes/sec
total size is 5,102,325 speedup is 1,590.00
[2021-01-13 19:40:16] INFO: deploy: Successful deployment
Traceback (most recent call last):
File "/home/s/nikola/lib/python3.8/site-packages/doit/doit_cmd.py", line 190, in run
return command.parse_execute(args)
File "/home/s/nikola/lib/python3.8/site-packages/doit/cmd_base.py", line 150, in parse_execute
return self.execute(params, args)
File "/home/s/nikola/lib/python3.8/site-packages/nikola/plugin_categories.py", line 145, in execute
return self._execute(options, args)
File "/home/s/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

[Kwpolska]

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

[mkkhg]

Thanks. I'm not familiar with Github, so missed the fact that the bug may be closed already.