boolean isBlank(String attribute)
Returns true if the attribute value is a zero-length string; otherwise, returns false.
A zero-length string can be compared to the string "". It is different from a null, whose presence is detected by the isNull() method.
If a collaboration needs to retrieve an attribute value and then do something with it, it can call isBlank() and isNull() to check that it has a value before retrieving the value.
The following example checks whether the Material attribute of the sourcePaperClip business object is a zero-length string.
boolean key = sourcePaperClip.isBlank("Material");