Error when running Pacu as CLI command and --session flag

[DaveYesland]

The following error is porduced when trying to run Pacu as a CLI command using the --session flag.
This should activate the specified session but instead can error out because it activates multiple sessions if the command has been run previously.

Traceback (most recent call last):
  File "/home/rhino/.local/bin/pacu", line 8, in <module>
    sys.exit(main())
  File "/home/rhino/.local/lib/python3.9/site-packages/pacu/__main__.py", line 10, in main
    pacu.Main().run()
  File "/home/rhino/.local/lib/python3.9/site-packages/pacu/main.py", line 1955, in run
    self.run_cli(args)
  File "/home/rhino/.local/lib/python3.9/site-packages/pacu/main.py", line 1792, in run_cli
    self.exec_module(module)
  File "/home/rhino/.local/lib/python3.9/site-packages/pacu/main.py", line 1051, in exec_module
    session = self.get_active_session()
  File "/home/rhino/.local/lib/python3.9/site-packages/pacu/main.py", line 592, in get_active_session
    return PacuSession.get_active_session(self.database)
  File "/home/rhino/.local/lib/python3.9/site-packages/pacu/core/models.py", line 157, in get_active_session
    return database.query(PacuSession).filter(PacuSession.is_active == True).scalar()  # noqa: E712
  File "/home/rhino/.local/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 3523, in scalar
    ret = self.one()
  File "/home/rhino/.local/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 3492, in one
    util.raise_(
  File "/home/rhino/.local/lib/python3.9/site-packages/sqlalchemy/util/compat.py", line 182, in raise_
    raise exception
sqlalchemy.orm.exc.MultipleResultsFound: Multiple rows were found for one()
Traceback (most recent call last):
  File "/home/rhino/.local/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 3490, in one
    ret = self.one_or_none()
  File "/home/rhino/.local/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 3467, in one_or_none
    raise orm_exc.MultipleResultsFound(
sqlalchemy.orm.exc.MultipleResultsFound: Multiple rows were found for one_or_none()