<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<!-- TestCase for empty feMerge component. You should see 2 green rects -->
<defs>
<filter id="MyFilter1">
    <feMerge>
    <feMergeNode/>
    </feMerge>
</filter>
<filter id="MyFilter2">
    <feOffset/>
    <feMerge>
    <feMergeNode/>
    </feMerge>
</filter>
</defs>
<rect fill="green" x="10" y="10" width="100" height="100" filter="url(#MyFilter1)"/>
<rect fill="green" x="130" y="10" width="100" height="100" filter="url(#MyFilter2)"/>
</svg>