Well, I think I've found a "solution" to the problem.
I still do not know the reason why my resolv.conf is empty when starting my laptop, but using the command
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sudo chattr +i /etc/resolv.conf
prevents definitely change, which, in principle, the problem is solved, although not the best solution.
I had thought to replace networkmanager wicd (I always liked more), but in recent versions NM works really well and I do not want to leave the system whith some installed units.