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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - WebRTC: RTCIceCandidate init dictionary don't handle explicit null or undefined values correctly"
   href="https://bugs.webkit.org/show_bug.cgi?id=158873#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - WebRTC: RTCIceCandidate init dictionary don't handle explicit null or undefined values correctly"
   href="https://bugs.webkit.org/show_bug.cgi?id=158873">bug 158873</a>
              from <span class="vcard"><a class="email" href="mailto:alex&#64;igalia.com" title="Alejandro G. Castro &lt;alex&#64;igalia.com&gt;"> <span class="fn">Alejandro G. Castro</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=281562&amp;action=diff" name="attach_281562" title="Proposed patch">attachment 281562</a> <a href="attachment.cgi?id=281562&amp;action=edit" title="Proposed patch">[details]</a></span>
Proposed patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=281562&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=281562&amp;action=review</a>

<span class="quote">&gt; Source/WebCore/Modules/mediastream/RTCIceCandidate.cpp:59
&gt; +    if (dictionary.getWithUndefinedOrNullCheck(&quot;sdpMLineIndex&quot;, sdpMLineIndexString)) {
&gt; +        if (!sdpMLineIndexString.isNull()) {</span >

I think you can join the 2 ifs in just one with an and condition. Also check if getWithUndefinedOrNullCheck returns false if undefined or null, maybe we do not need the second condition.</pre>
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