Clean up spec text a bit

index.html

@@ -2099,32 +2099,32 @@ <h3>
           for processing the <code>scope</code> member of a service worker</a>
           passing <var>unprocessed registration</var>.
           </li>
-          <li>If <var>scope</var> is not <code>undefined</code>,
-          set <var>registration</var>'s <code>scope</code>
+          <li>If <var>scope</var> is <code>undefined</code> abort these steps and
+          return <code>undefined</code>.
+          </li>
+          <li>Otherwise, set <var>registration</var>'s <code>scope</code>
           property to be <var>scope</var>.
           </li>
           <li>Let <var>type</var> be the result of running the <a>steps
           for processing the <code>type</code> member of a service worker</a>
           passing <var>unprocessed registration</var>.
           </li>
-          <li>If <var>type</var> is not <code>undefined</code>
-          set <var>registration</var>'s <code>type</code>
-          property to be <var>type</var>.
-          </li>
           <li>If <var>type</var> is <code>undefined</code> abort these steps and
           return <code>undefined</code>.
           </li>
+          <li>Otherwise, set <var>registration</var>'s <code>type</code>
+          property to be <var>type</var>.
+          </li>
           <li>Let <var>use cache</var> be the result of running the <a>steps
           for processing the <code>use_cache</code> member of a service worker</a>
           passing <var>unprocessed registration</var>.
           </li>
-          <li>If <var>use cache</var> is not <code>undefined</code>,
-          set <var>registration</var>'s <code>use_cache</code>
-          property to be <var>use cache</var>.
-          </li>
           <li>If <var>use cache</var> is <code>undefined</code> abort these steps
           and return <code>undefined</code>.
           </li>
+          <li>Otherwise, set <var>registration</var>'s <code>use_cache</code>
+          property to be <var>use cache</var>.
+          </li>
           <li>Return <var>registration</var>.
           </li>
         </ol>