What is the requirement to create a material without description ??
As you have created a new material type, so I think you want to create material without description only for this material type...
SAP doesn't allow to create a material master without description...
If it is for any report purpose, or you don't want to take the printout for the material description, then you can wrote in the description field as "NO DESCRIPTION"
Else please explain the business process.