Hot fix for issue #95

[HeloiseS]

#95 Should not longer be a problem with this fix in cmd.py

I made sure to catch both "flavours" of slashes so that the windows people also get the error

141         assert MODELS_PATH[-1]=="/" or MODELS_PATH[-1]=='\\', f"DEBUGGING ASSISTANT: Directory MODELS_PATH = {MODELS_PATH}"\ 
142                                                              f"does not end with '/' or '\\' "