Bug 155365 Can not set data type to "date time" when editing "Data Item"
Description: Can not set data type to "date time" when editing "Data Item" Steps to reproduce: 1. Insert a data item to the layout 2. Name it and set the expression to "a = new Date()" 3. Select the data type to date time 4. Press ok Actual result: An Birt Exception is thrown out. Expected result: No NPE thrown out
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
handleDelEvent( );
					}
					catch ( Exception e1 )
					{
						WidgetUtil.processError( getShell( ), e1 );
					}
					refreshBindingTable( );
				}
			}
		} );
		table.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				selectIndex = table.getSelectionIndex( );
				updateButtons( );
			}
		} );
		String[] columns = null;
		int[] columnWidth = null;
		CellEditor[] cellEditors;
		expressionCellEditor = new ExpressionCellEditor( table );
		columns = new String[]{
				null,
				COLUMN_NAME,
				COLUMN_DATATYPE,
				COLUMN_EXPRESSION,
				COLUMN_AGGREGATEON
		};
		columnWidth = new int[]{
				canSelect ? 25 : 20, 150, 70, 150, 150,