Value :: isEmpty - Is property instance empty?
The function returns whether the value handle contains data (false) or not (true). A value is considered as empty when:
- the value is false (LOGICAL)
- the value is 0 (INT, REAL, Enumeration, Date, Time, DateTime)
- the value is "" (CHAR, STRING,CCHAR, MEMO)
- when all properties are empty (for complex data type properties)
The property throws an exception, when the property handle is not valid.
Return value: Success ( bool )
The value is true when the function was executed successfully. Otherwise the value is set to false.