Bug 121687 Exception throws when export data in table which inside a grid cell.
Description: Exception throws when export data in table which inside a grid cell. Steps to reproduce: 1. insert a grid. 2. insert one table to one grid cell. 3. insert another table to the other grid cell. 4. export data in two tables. Expected result: Data are exported. Actual result: Exception in: ReportEngineService.getMetaData( )
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/Report.java
this.parameters.add( parameter );
	}
	/**
	 * Finds a master page with given name.
	 * 
	 * @param name
	 *            The name of the master page to locate.
	 * @return A <code>MasterPageDesign</code> object that describes the
	 *         master page, or <code>null</code> if no master page of the
	 *         given name is found.
	 */
	public MasterPageDesign findMasterPage( String name )
	{
		assert ( name != null );
		return this.pageSetup.findMasterPage( name );
	}
	/**
	 * @return Returns the unit.
	 */
	public String getUnit( )
	{
		return unit;
	}
	/**
	 * @param unit
	 *            The unit to set.
	 */
	public void setUnit( String unit )
	{
		this.unit = unit;