Fixed the bug: loosing table design on table cloning.

OriginalTab -> CloneOfOriginalTab -> Clone of CloneOfOriginalTab did not work.

DocX/Table.cs

@@ -785,19 +785,29 @@ namespace Novacode
 
                 if (design == TableDesign.Custom)
                 {
-                    if (string.IsNullOrEmpty(_customTableDesignName))
-                    {
-                        design = TableDesign.None;
-                        if (style != null)
-                            style.Remove();
-
-                    }
-                    else
-                    {
-                        val.Value = _customTableDesignName;
-                    }
-                }
-                else
+					#region Code is commented out
+					// The code gives a problem while copiing a table.
+					// Look at Test_Clone_Table_Twice method in test.
+					//Example:
+					//Table tab1 = doc.Tables[ 0 ];
+					//Table tab2 = doc.InsertTable( tab1 );
+					//Table tab3 = doc.InsertTable( tab2 ); - here we have exception at "var styleElement =" line below in this method
+					// The source of the problem is loosing the "<w:tblStyle w:val="a3"/>" by the commented code
+
+					//if (string.IsNullOrEmpty(_customTableDesignName))
+					//{
+					//    design = TableDesign.None;
+					//    if (style != null)
+					//        style.Remove();
+
+					//}
+					//else
+					//{
+					//    val.Value = _customTableDesignName;
+					//}
+					#endregion
+				}
+				else
                 {
                     switch (design)
                     {
@@ -1132,9 +1142,10 @@ namespace Novacode
                         let styleId = e.Attribute(XName.Get("styleId", DocX.w.NamespaceName))
                         where (styleId != null && styleId.Value == val.Value)
                         select e
-                    ).First();
+                    ).FirstOrDefault();
 
-                    Document.styles.Element(XName.Get("styles", DocX.w.NamespaceName)).Add(styleElement);
+					if( styleElement != null )
+						Document.styles.Element(XName.Get("styles", DocX.w.NamespaceName)).Add(styleElement);
                 }
             }
         }

UnitTests/DocXUnitTests.cs

@@ -296,6 +296,29 @@ namespace UnitTests
 			}
 		}
 
+		[Test]
+		public void Test_Clone_Table_Twice()
+		{
+			using( var input = File.Open( Path.Combine( _directoryWithFiles, "TableSpecifiedHeights.docx" ), FileMode.Open ) )
+			{
+				using( var doc = DocX.Load( input ) )
+				{
+					// Make sure content of the file is ok for test
+					Assert.IsTrue( doc.Tables.Count == 1 );
+
+					Table tab1 = doc.Tables[ 0 ];
+					doc.InsertParagraph( "" );
+					Table tab2 = doc.InsertTable( tab1 );
+					Assert.IsTrue( doc.Tables.Count == 2 );
+					doc.InsertParagraph( "" );
+					Table tab3 = doc.InsertTable( tab2 );
+					Assert.IsTrue( doc.Tables.Count == 3 );
+
+					doc.SaveAs( Path.Combine( _directoryWithFiles, "TwoClonedTables.docx" ) );
+				}
+			}
+		}
+
 		public string ReplaceFunc(string findStr)
         {
             var testPatterns = new Dictionary<string, string>