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/internal/ui/dialogs/DataItemBindingDialog.java
this.aggregateOns = aggregateOns;
		}
		else
		{
			this.aggregateOns = new String[aggregateOns.length + 1];
			this.aggregateOns[0] = ALL;
			System.arraycopy( aggregateOns,
					0,
					this.aggregateOns,
					1,
					aggregateOns.length );
		}
		initAggregateOns( );
	}
	public void setAggregateOnSelect( String aggregateOnSelect )
	{
		this.aggregateOnSelect = aggregateOnSelect;
		initAggregateOns( );
	}
	protected DesignElementHandle getBindingObject( )
	{
		return DEUtil.getBindingHolder( input );
	}
	public void setDataTypes( String[] dataTypes )
	{
		this.dataTypes = dataTypes;
		initDataTypes( );
	}
	public void setExpression( String expression )
	{