adding LineSeparator to a Phrase added in the ColumnText clreate an [OBJ] text in the output pdf

[alesky78]

as the title described

more simple showing the code and attach the output generated and a unit test that create the issue
`
ColumnText ct = new ColumnText(writed);
Phrase p = null;

	for (int i = 0; i < 50; i++) {
		p = new Phrase();
		p.add(new LineSeparator(0.3f, 100, null, Element.ALIGN_CENTER, -2));
		ct.addText(p);
                ct.addText(Chunk.NEWLINE);
	}

`

in attach i added the output of the pdf in the file name "test_OK_columnTextSeparatorOpenPDF.pdf"
as you can see the output pdf file is create wiht an rectagle wiht OBJ wrote inside
attached also the code that generate this output (the txt file are just java files)

in IText it is working fine
repeated the same test using directly IText wiht this version 5.5.13.2
and added the java class (again .txt) and the output pdf also that test it

ColumnTextSeparatorOpenPDF.txt
test_OK_columnTextSeparatorOpenPDF.pdf
ColumnTextSeparatorIText.txt
test_OK_columnTextSeparatorIText.pdf