Bug 202236 When select NULL value for multi-value parameter, cause NPE.
Description: When select NULL value for multi-value parameter, cause NPE. Build number: 2.2.1 Steps to reproduce: 1, New a list parameter, check Allow multi-value, uncheck isRequired 2, Select parameter data type as Date 3, Add some items into list 4, Preview 5, Select Null Value item in list Expected result: Can accept Null value for multi-value parameter Actual result: Cause NPE.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
defaultOptions = (IRenderOption) configs
					.get( IRenderOption.OUTPUT_FORMAT_HTML );
		}
		if ( defaultOptions != null )
		{
			options.putAll( defaultOptions.getOptions( ) );
		}
		
		IRenderOption formatOptions = (IRenderOption) configs.get( format );
		if ( formatOptions != null )
		{
			options.putAll( formatOptions.getOptions( ) );
		}
		
		if ( emitterID != null )
		{
			IRenderOption emitterOptions = (IRenderOption) configs
					.get( emitterID );
			if ( emitterOptions != null )
			{
				options.putAll( emitterOptions.getOptions( ) );
			}
		}
		
		if ( renderOptions != null )
		{
			options.putAll( renderOptions.getOptions( ) );
		}
		
		IRenderOption allOptions = new RenderOption( options );