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
{
			if ( ABSOLUTE_FONT_SIZE_CONSTANTS[i].equals( baseConstant ) )
			{
				if ( DesignChoiceConstants.FONT_SIZE_LARGER
						.equals( relativeConstant ) )
				{
					if ( i == ABSOLUTE_FONT_SIZE_CONSTANTS.length - 1 )
						return ABSOLUTE_FONT_SIZE_CONSTANTS[i];
					return ABSOLUTE_FONT_SIZE_CONSTANTS[i + 1];
				}
				else if ( DesignChoiceConstants.FONT_SIZE_SMALLER
						.equals( relativeConstant ) )
				{
					if ( i == 0 )
						return ABSOLUTE_FONT_SIZE_CONSTANTS[i];
					return ABSOLUTE_FONT_SIZE_CONSTANTS[i - 1];
				}
			}
		}
		assert false;
		return null;
	}
	/**
	 * Gets the absolute dimension value of font size with the given relative
	 * value.
	 * 
	 * @param relativeDimensionValue
	 *            the relative dimension value
	 * 
	 * @return the absolute dimension value