Minor changes.

Check if styles set is initialized.
Delete unnecessary test.

Author: ars18wrw

layout/src/main/java/com/itextpdf/layout/element/Cell.java

@@ -196,7 +196,9 @@ public Cell clone(boolean includeContent) {
         newCell.row = row;
         newCell.col = col;
         newCell.properties = new HashMap<>(properties);
-        newCell.styles = new LinkedHashSet<>(styles);
+        if (null != styles) {
+            newCell.styles = new LinkedHashSet<>(styles);
+        }
         if (includeContent) {
             newCell.childElements = new ArrayList<>(childElements);
         }

layout/src/test/java/com/itextpdf/layout/TableTest.java

@@ -1285,27 +1285,6 @@ public void cellAlignmentAndSplittingTest01() throws IOException, InterruptedExc
     }
 
 
-    @Test
-    public void memoryTest01() throws IOException, InterruptedException {
-        String testName = "memoryTest01.pdf";
-        String outFileName = destinationFolder + testName;
-        String cmpFileName = sourceFolder + "cmp_" + testName;
-
-        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(outFileName));
-        Document doc = new Document(pdfDoc);
-
-        Table table = new Table(5);
-        for (int i = 0; i < 20000; i++) {
-            for (int j = 0; j < 5; j++) {
-                table.addCell(j + " Liberté!\nÉgalité!\nFraternité!");
-            }
-        }
-        doc.add(table);
-
-        doc.close();
-        Assert.assertNull(new CompareTool().compareByContent(outFileName, cmpFileName, destinationFolder, testName + "_diff"));
-    }
-
     @Test
     public void cellAlignmentAndKeepTogetherTest01() throws IOException, InterruptedException {
         String testName = "cellAlignmentAndKeepTogetherTest01.pdf";