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
if ( includeParameterGroups )
		{
			return parameters;
		}
		if ( allParameters != null )
		{
			return allParameters;
		}
		allParameters = new ArrayList( );
		flattenParameter( parameters );
		return allParameters;
	}
	public HashMap getConfigs( )
	{
		HashMap configs = new HashMap( );
		Iterator iter = reportDesign.configVariablesIterator( );
		if ( iter != null )
		{
			while ( iter.hasNext( ) )
			{
				ConfigVariableHandle handle = (ConfigVariableHandle) iter
						.next( );
				String name = handle.getName( );
				String value = handle.getValue( );
				configs.put( name, value );
			}
		}
		return configs;
	}
	public String getAfterCloseDoc( )