egressbuster.py doesn't send packet if "shell" argument is not specified

[jcdocd]

Hello,
Thanks for this project.

It seems that egressbuster.py doesn't send packet if the "shell" argument is not specified.
Are you able to reproduce the issue ?

Thanks,
Regards.

[pierce403]

I am also seeing this behavior.

I think I figured out the issue, PR incoming.