Bug 195607 NPE is thrown when calling DimensionHandle:: getAbsoluteValue()
If a DimensionHandle did not set DimensionValue, NPE will thrown when calling DimensionHandle:: getAbsoluteValue().
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/FontSizeValueHandler.java
{
	/**
	 * Default constructor.
	 * 
	 * @param dimensionHandle
	 */
	FontSizeValueHandler( DimensionHandle dimensionHandle )
	{
		super( dimensionHandle );
	}
	/**
	 * Converts one font size constant to dimension value.
	 * 
	 * @param fontSizeConstant
	 *            the font size constant to convert, relative or absolute.
	 * @return the converted dimension value. Return <code>null</code> if the
	 *         given <code>fontSizeConstant</code> is invalid.
	 */
	DimensionValue convertFontSizeConstant( String fontSizeConstant )
	{
		if ( DimensionUtil.isAbsoluteFontSize( fontSizeConstant ) )
		{
			return provider.getValueOf( fontSizeConstant );
		}