public static boolean isUndefinedData(Program program, Address addr) {
		Data data = program.getListing().getDataAt(addr);
		return Undefined.isUndefined(data.getDataType());
	}
Determine if the specified addr corresponds to an undefined data location
where both undefined code units and defined data which has an Undefined
data type is considered to be undefined.
@param program the program
@param addr the data address
@return true if the data is undefined
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/DataUtilities.java