plugin_e2ee: handle empty args in /foo_state commands

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
10 jobs for main in 2 minutes and 47 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Lint
passed #33423
mypy

00:01:23

failed #33421
pylint-latest

00:02:15

passed #33422
pylint-plugins

00:02:45

passed #33420
security-check

00:01:03

 
  Test
skipped #33427
pytest-3.10
skipped #33424
pytest-3.7
skipped #33425
pytest-3.8
skipped #33426
pytest-3.9
 
  Build
skipped #33428
www
build-doc
skipped #33429
build-ubuntu
 
Name Stage Failure
failed
pylint-latest Lint
Finished processing dependencies for poezio==0.13.1.dev246
$ pylint -E poezio
************* Module poezio.connection
poezio/connection.py:90:12: E1101: Instance of 'object' has no 'resource' member (no-member)
poezio/connection.py:249:12: E1101: Instance of 'Connection' has no 'handler' member (no-member)
************* Module poezio.core.core
poezio/core/core.py:569:26: E1101: Instance of 'object' has no 'split' member (no-member)
Cleaning up file based variables
ERROR: Job failed: exit code 1