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
{
				absoluteConstantFound = true;
				break;
			}
			e = e.getContainer( );
		}
		
		if ( !absoluteConstantFound )
		{
			Object defaultValue = dimensionHandle.getDefn( ).getDefault( );
			if ( defaultValue instanceof DimensionValue )
				return (DimensionValue) defaultValue;
			stack.push( defaultValue );
		}
		
		assert !stack.isEmpty( );
		
		
		String absoluteFontSizeConstant = (String) stack.pop( );
		while ( !stack.isEmpty( ) )
		{
			String constant = (String) stack.pop( );
			absoluteFontSizeConstant = convertRelativeConstantToAbsolute(
					constant, absoluteFontSizeConstant );
		}
		return provider.getValueOf( absoluteFontSizeConstant );
	}
	/**
	 * Converts one relative font size constant to the absolute one based on the
	 * given absolute one. The sequence for conversion is: