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/utility/DataUtil.java
* Convert to UTF-8 bytes
	 * 
	 * @param bytes
	 * @return
	 */
	public static String toUTF8( byte[] bytes )
	{
		assert bytes != null;
		String str = null;
		try
		{
			str = new String( bytes, "utf-8" ); 
		}
		catch ( UnsupportedEncodingException e )
		{
		}
		return str;
	}
	/**
	 * Returns oda type name
	 * 
	 * @param odaTypeCode
	 * @return
	 */
	public static String getOdaTypeName( int odaTypeCode )
	{
		switch ( odaTypeCode )
		{
			case Types.INTEGER :
				return "INT";