HP Prime crashes on undef-undef*i in CAS

[parisse]

Well, it's not the CAS code that prints, the CAS print command calls a conversion from a CAS object to a Home object and then the Home object is printed (BTW, this may be the reason why there is a crash, converting objects is of course harder to code than when I code for CAS staying in CAS code and HP codes for Home staying in Home code).