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
if ( canSelect )
		{
			( (CheckboxTableViewer) bindingTable ).setAllChecked( false );
			( (CheckboxTableViewer) bindingTable ).setGrayed( dummyChoice, true );
			if ( getSelectColumnHandle( ) != null )
			{
				( (CheckboxTableViewer) bindingTable ).setChecked( getSelectColumnHandle( ),
						true );
			}
		}
	}
	protected void addBinding( ComputedColumn column )
	{
		try
		{
			DEUtil.addColumn( DEUtil.getBindingHolder( inputElement ),
					column,
					false );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
		}
	}
	protected List getBindingList( DesignElementHandle inputElement )
	{
		return DEUtil.getVisiableColumnBindingsList( inputElement );
	}
	private int canChangeDataSet( String newName )
	{