I confess I haven't tried it. I usually leave the most recent
two months of trash in place, 'just in case'. So I always
select everything below that, and invoke the process with the
Red Icon. Probably haven't used the Menu command in years.
I created another mailbox and moved the stuff I want to save
into it, for test purposes. When I selected all the remaining
trash, the three offending empty entries [say that five times
fast] were stacked as the bottom three entries in the batch,
and were also selected. I de-selected the whole batch, and used
the Menu's Empty Trash command, it appears to have deleted
everything, including the stuck, blank entries. I restored the
saved trash to the (trash) folder, and selected it all. Seems
like the offending entries are gone.
I confess I'd never have guessed that the two different ways of
invoking Empty Trash would act differently.
Thanks, Rich, for the help!