Do not leave unreachable TableColumnUndo/TableRowUndo in case of exceptions

... which might be a memory leak otherwise.

Change-Id: I5e911ba815c3df519365236043fccc7ff21c60b4
Reviewed-on: https://gerrit.libreoffice.org/9979Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

svx/source/table/tablecolumn.cxx

@@ -209,10 +209,14 @@ void SAL_CALL TableColumn::setFastPropertyValue( sal_Int32 nHandle, const Any& a
             break;
         }
     default:
+        delete pUndo;
         throw UnknownPropertyException();
     }
     if( !bOk )
+    {
+        delete pUndo;
         throw IllegalArgumentException();
+    }
 
     if( bChange )
     {

svx/source/table/tablerow.cxx

@@ -283,10 +283,14 @@ void SAL_CALL TableRow::setFastPropertyValue( sal_Int32 nHandle, const Any& aVal
             break;
         }
     default:
+        delete pUndo;
         throw UnknownPropertyException();
     }
     if( !bOk )
+    {
+        delete pUndo;
         throw IllegalArgumentException();
+    }
 
     if( bChange )
     {