Bug 207897 [Automation][Regression]A DataException is thrown out when preview reportdesign
Description: A DataException is thrown out when preview reportdesign Test Date: 20071030 Test Build: BIRT2.2.2 v20071029 Step to reproduce: 1. Use the reportdesign attached 2. Preview it Expect result: Report can be previewed without any exception. Actual result: A DataException is thrown out.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
return null;		
	}
	
	public void setParameterDisplayText( String name, String displayText )
	{
		Object parameter = params.get( name );
		if ( parameter != null )
		{
			( (ParameterAttribute) parameter ).setDisplayText( displayText );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.executor.IFactoryContext#getConfigs()
	 */
	public Map getConfigs( )
	{
		return configs;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.executor.IFactoryContext#getReportDesign()
	 */
	public ReportDesignHandle getDesign( )
	{
		return (ReportDesignHandle) runnable.getDesignHandle( );
	}
	/**