Bug 147819 Dynamic parameter, if value column datas include null datas, preview, system throws exception
Dynamic parameter, if value column datas include null datas, preview, system throws exception Step: data source: sample DB data set: select * from CLASSICMODELS.CUSTOMERS 1.Create a dynamic parameter 2.Display type select List Box, value columm select "State"; display text select "CUSTOMERNAME"; 3.Preview in html Actual Results: 1.System throws Http status 500 exception
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/ParameterValidationUtil.java
* @return the validated value if the input value is valid for the given
	 *         data type and format choice string
	 * @throws ValidationValueException
	 *             if the input value is not valid with the given data type and
	 *             format string
	 */
	static public Object validate( String dataType, String format, String value )
			throws ValidationValueException
	{
		return validate( dataType, format, value, DEFAULT_LOCALE );
	}
	/**
	 * Validates the input boolean value with the given locale.
	 * 
	 * @param value
	 *            the input value to validate
	 * @param locale
	 *            the locale information
	 * @return the <code>Boolean</code> object if the input is valid,
	 *         otherwise <code>null</code>
	 * @throws ValidationValueException
	 */
	static private Boolean doValidateBoolean( String value, ULocale locale )
			throws ValidationValueException
	{
		if ( StringUtil.isBlank( value ) )
			return null;
		
		if ( value.equalsIgnoreCase( BooleanPropertyType.TRUE ) )
			return Boolean.TRUE;