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
while ( e != null )
		{
			if ( !computedPropertyFound )
			{
				propValue = e.getElement( ).getStrategy( )
						.getPropertyFromElement( dimensionHandle.getModule( ),
								e.getElement( ), dimensionHandle.propDefn );
				if ( propValue != null )
				{
					computedPropertyFound = true;
				}
			}
			if ( computedPropertyFound )
			{
				propValue = e.getElement( ).getStrategy( )
						.getPropertyFromElement( dimensionHandle.getModule( ),
								e.getElement( ), fontSizePropDefn );
				if ( propValue != null )
					break;
			}
			
			if ( !dimensionHandle.propDefn.canInherit( ) )
				break;
			e = e.getContainer( );
		}
		if ( e != null )
			return e.getDimensionProperty( IStyleModel.FONT_SIZE_PROP );
		return null;
	}
}