lconfig command not checking if machine exists

[lorenzo93]

Operating System

MacOS 14.1.1

Kathará Version

3.7.0

Bug Description

If an lconfig command is issued with as parameter a non existent machine, Kathará throws an exception instead of an error

Steps To Reproduce

• Get a Kathará lab
• Run the Kathará lab with kathara lstart
• Try to add an interface to a non existing machine kathara lconfig -n non_existing_machine --add A

You will get this error CRITICAL - (AttributeError) 'NoneType' object has no attribute 'reload'

Expected Behavior

Kathará should give a proper error.

Check Command Output

*       Current Manager is: Docker (Kathara)
*       Manager version is: 24.0.6
*       Python version is: 3.10.11 (v3.10.11:7d4cc5aa85, Apr  4 2023, 19:05:19) [Clang 13.0.0 (clang-1300.0.29.30)]
*       Kathara version is: 3.7.0
*       Operating System version is: macOS-14.1.1-arm64-arm-64bit
*       Trying to run `Hello World` container...
Deploying devices...|########################################################################################################| 1/1
*       Container run successfully.
Deleting devices...|#########################################################################################################| 1/1