Comment 1 for bug 1232077

So we either pipe stderr to stdout for this (and other) job(s), which should work because checkbox at least knows to use one if the other is empty, or we modify the core to output both stderr and stdout in all cases.

This was done to help the user discern useful output from debugging or useless stuff, and the problem is that, as you see, useful information may be lost despite scripts' best attempts to use stdout/stderr sensibly.