Find and Replace in Attribute Table using ArcGIS 10.1

Hi,

Does anyone know how to Find and Replace <Null> in the attribute table in ArgGIS 10.1? I have tried <Null>, " ", Null, Is Null, a space, etc, but no luck so far.

This issue was brought up 2 years ago when the answers to the query suggested that it may not be possible to Find and Replace <Null> and that the slow option of selecting by attribute and using the field calculator on a field by field basis should be used instead. I wonder if, meanwhile, a faster solution has emerged?

Many thanks,
Amanda