How do I catch errors with Apache::Upload

[jonathan vanasco]

Apache::Upload seems to be  working fine -- as long as I upload 
something

If i upload nothing, i get all sorts of errors.  i assumed I would get 
them, as this problem came about while I was trying to work in routines 
for handling data of the wrong type.  I just can't figure out how one 
catches the errors.

so, how does one validate the integrity of an upload (in terms of 
something actually being uploaded).  trying to access any aspect of the 
upload object triggers an error, and the docs dont show me any sort of 
other way to access the error.