Need to Delete Empty Blocks via Groovy Rule

Summary

Restructure & Clear Cube Not Working

Content

Hello,

If possible I need to delete empty blocks from a BSO cube using a rule.  The ClearBlock All function is not doing it.

Here is what I have tried:

1. I setup a Clear Cube defintion using the flag Empty Blocks.  I tried calling the job from a groovy business rule using the API, which was unsuccessful.  
I think there has to be members selected and a MDX query generated for it to work for the business rule.  
I have other clear cube groovy rules working, so I know the connection and syntax are ok.