Blank Searches do not always work as expected. However, they can be coded to work.
The goal of BigBusiness is to utilize a precision Database and make it work intuitively. Where the default behavior is counter-intuitive, it can be extended to be more friendly.
As an example, Vendor Name in the Items Search now works with Is Equal To [blank]. If search results don't match your intuition, please email to support@bigbusiness.com.