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/DimensionHandle.java
if ( IStyleModel.FONT_SIZE_PROP.equals( getDefn( ).getName( ) ) )
			{
				FontSizeValueHandler fontSizeValueHandle = new FontSizeValueHandler(
						this );
				return fontSizeValueHandle
						.convertFontSizeConstant( (String) value );
			}
		}
		else
		{
			assert value instanceof DimensionValue;
			DimensionValue dimensionValue = (DimensionValue) value;
			
			if ( CSSLengthValueHandler
					.isAbsoluteUnit( dimensionValue.getUnits( ) ) )
				return dimensionValue;
			
			
			if ( !propDefn.isStyleProperty( ) || getElement( ).isStyle( ) )
				return null;
			
			if ( IStyleModel.FONT_SIZE_PROP.equalsIgnoreCase( getPropertyDefn( )
					.getName( ) ) )
			{
				FontSizeValueHandler fontSizeValueHandler = new FontSizeValueHandler(
						this );
				return fontSizeValueHandler
						.getAbsoluteValueForFontSize( dimensionValue );
			}