Testing for a blank multiline attribute

[Michael Pokraka]

Hello wuggers, 
I think I've got the perfect Friday afternoon problem for you: 

What is the best way to check for a blank multiline element? 

Using '&MULTI& EX' as the condition works fine if there are NO entries. However
if the assignment comes from an attribute you will always get a single blank
entry if the attribute has no value. Having an attribute which doesn't return
anything if it fails will cause the WF to error with "Error when determining
attribute 'FOO' of object instance '[BO.BAR.]". Checking if it's blank as per a
single element ('&ELEMENT& =') doesn't work. 

Of course it's possible to work around, but it seems something that should be
checkable in a simple condition, or even two OR'ed or AND'ed conds, but I can't
seem to spot it. I've a feeling that I've encountered this before but memory
fails....

Inputs appreciated, 
Cheers & happy Friday

Michael Pokraka
Workflow Connections Ltd.
Tel.: +44 (0)7786 910 855