ISEMPTY
The ISEMPTY function identifies if a variable or one or more of its partitions has values.
Return Value
BOOLEAN
FALSE when the specified variable or partitions have values; TRUE when they are empty.
 
Syntax
ISEMPTY( variable [(PARTITION partition [,PARTITION partition]...)])
 
Parameters
- variable
- 
The name of the variable to check for values. 
- partition
- 
The name of one or more partitions of variable, separated by commas, to check for values.