I've found in the code that all scripts go through dpkg-query --search and that's the issue: as I've compiled hitch software myself, it doesn't belong to any package.
Could there be a fallback for all those scripts? I don't see the need to package my own .deb for such softwares, so as long as it is found, it should be shown in the final report. Maybe add a new argument to avoid showing those non-packaged scripts. I'm not familiar with python, so I won't provide a patch for this. For now I'll use «-v» to find out all processes. Thanks for this great tool :-) Yvan.