Bug 207250 Check blank value for datetime type parameter from url.[0002][0705]
Description: Check blank value for datetime type parameter from url. Build number:2.3.0.v20071023 Steps to reproduce: 1. New a datetime parameter mydt,listbox, tick off isRequired. 2. Preview in external browser and add "&dt=" in url, press enter. Expected result: Error message to indicate blank value isn't allowed for this parameter. Actual result: No error message and blank value is accepted. I tried to new a jsp and use <birt:paramDef> to pass the blank value and the blank value is accepted,too. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
* 
	 * @param configVarName
	 *            String
	 * @param parameterList
	 *            Collection
	 * @return String
	 */
	private String getParameterName( String configVarName,
			Collection parameterList ) throws ReportServiceException
	{
		String paramName = null;
		if ( parameterList != null )
		{
			for ( Iterator iter = parameterList.iterator( ); iter.hasNext( ); )
			{
				ParameterDefinition parameter = (ParameterDefinition) iter
						.next( );
				
				String curName = null;
				if ( parameter != null && parameter.getName( ) != null )
				{
					curName = parameter.getName( ) + "_" + parameter.getId( ); 
				}
				
				if ( curName != null
						&& curName.equalsIgnoreCase( configVarName ) )
				{
					paramName = parameter.getName( );
					break;
				}