[BUG]: hashtopolis/agent-python crash on empty lock file

[rixvet]

Version Information

hastopolis-agent s3-python-0.7.2.1

Hashcat

No response

Description

Current behaviour

Unable to start client if empty lock.pid file exists:

$ stat lock.pid  | head -2
  File: lock.pid
  Size: 0               Blocks: 0          IO Block: 4096   regular empty file

$ python3 hashtopolis.zip
Found existing lock.pid, checking if python process is running...
Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "hashtopolis.zip/__main__.py", line 360, in <module>
ValueError: invalid literal for int() with base 10: ''

Expected behaviour
Handle empty lockfile or raise more meaningful error message