Command Reference : String and Date Function Reference
  
 
@isempty
Syntax: @isempty(str)
Argument: string, str
Return: integer
Tests for whether str is a blank string, returning a 1 if str is a null string, and 0 otherwise.
Example:
@isempty("1.23415")
returns a 0, while
@isempty("")
return the value 1.
See also @len, @length.