implemented code review remarks

resolves DEVSIX-1398

Autoported commit.
Original commit hash: [28bdf7fff]

Author: joris.schellekens

itext/itext.layout/itext/layout/renderer/CollapsedTableBorders.cs

@@ -77,7 +77,7 @@ protected internal virtual iText.Layout.Renderer.CollapsedTableBorders CollapseA
                     currentRow = rows[row];
                     bool hasCells = false;
                     for (int col = 0; col < numberOfColumns; col++) {
-                        if (null != currentRow && null != currentRow[col]) {
+                        if (null != currentRow[col]) {
                             int colspan = (int)currentRow[col].GetPropertyAsInteger(Property.COLSPAN);
                             if (rowspansToDeduct[col] > 0) {
                                 int rowspan = (int)currentRow[col].GetPropertyAsInteger(Property.ROWSPAN) - rowspansToDeduct[col];

port-hash

@@ -1 +1 @@
-d8c7cb4e34fcb443ea942a4bfa7defc77d12e1b5
+28bdf7fff3502700d5093408fa91d35c180e5973