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That sab accepts the NZB whenever the script does not exit with 0 is understood. Which makes the situation with the above mentioned script (sab refusing every NZB with default/empty category) even stranger.
Adapting the script to test for an empty variable and setting a pseudo value was no problem at all.
But in order to learn, I try to understand why things happen the way they do.
Guess we'll never know. Anyway - thanks for indulging me on my "journey"
P.S.: What do you mean with "debug sabnzbd"? Setting the logging level to debug does not yield any more relevant log entries concerning pre-queue scripts than the default level. That was the first thing I did