If there was an error during initialisation the execution time is output (to stderr by default).
$ python pwb.py scripts/checkimages.py -family:wikidata -lang:wikidata -simulate
Your project is not supported by this script.
You have to edit the script and add it!
Execution time: 0 seconds
This undesirable line of output previously occurred when -help was used, but that part has been fixed.