Orphaned agents are not handled properly

[Hubbl3]

Empire Version

3.0 beta

OS Information (Linux flavor, Python version)

Kali 2019.3

Expected behavior and description of the error, including any actions taken immediately prior to the error. The more detail the better.

If all agents are removes the db with an active agent running when the agent checks back in an error is thrown and it produces a new agent check in everytime that agent calls back.

Empire should be able to identify an orphaned agent and re-register it the db

Screenshot of error, embedded text output, or Pastebin link to the error

Any additional information

[Hubbl3]

The issue has been isolated to python 3.x only. When run as python 2.7 the issue does not occur. The problem seems to be related to the session ID not updating in agents.py when the orphaned agent rechecks in