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Data validation ,in which the multi-picklist filed must not be blank

Hi all,
I need to write a  Data validation ,in which the multi-picklist filed  must not be blank ,for certain criteria.But in Salesforce.com  Multi-picklist values are not supported for Data Validation.How can I overcome this?
 
Thank you
ghealyghealy
A validation rule:

ISPICKVAL( Your_Field_Name , "")