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/ComputedValueHandler.java
* Default constructor.
	 * 
	 * @param dimensionHandle
	 */
	
	ComputedValueHandler( DimensionHandle dimensionHandle )
	{
		super( dimensionHandle );
	}
	/**
	 * Returns the absolute value for other length property, instead of font
	 * size.
	 * 
	 * @param relativeDimensionValue
	 *            the relative dimension value
	 * @return the absolute dimension value
	 */
	DimensionValue getAbsoluteValueForLength(
			DimensionValue relativeDimensionValue )
	{
		DimensionValue absoluteFontSizeValue = getDefaultFontSizeValue( );
		DimensionHandle factualFontSizeHanle = getFactualFontSizeHandle( );
		if ( factualFontSizeHanle != null )
		{
			DimensionValue absoluteFontSizeValueTemp = factualFontSizeHanle
					.getAbsoluteValue( );
			if ( absoluteFontSizeValueTemp != null )
			{
				absoluteFontSizeValue = absoluteFontSizeValueTemp;
			}