Thanks for your pull request!, will try and test this soon

Hi,

I've just added a couple more validation checks, to make sure that an address is obtained either from a parameter or
it's obtained by searching for it.

Unfortunately during my current testing, I can't seem to trigger the line:
print("No services found for address ", addr, file=sys.stderr)

I'll try again, to see if I can get it to trigger, to see if your pull request fixes it for me.

Thanks

You will not see the line No services found for address appearing as I removed this part of the code and replaced by a static information.
Instead of having the error message and quit the code, I updated the code in order to use the same behavior as using the --addr <ADDRESS> with a specific ADDRESS defined