* Handle the case where there is no cached build step that produced

outpath.  This can happen if the build was performed outside of
  Hydra.

src/root/build.tt

@@ -150,7 +150,7 @@
     <td>[% INCLUDE renderDateTime timestamp = build.timestamp %]</td>
   </tr>
   [% IF build.finished && build.resultInfo.buildstatus != 4 %]
-    [% IF build.resultInfo.iscachedbuild %]
+    [% IF build.resultInfo.iscachedbuild && cachedBuild %]
       <tr>
         <th>Cached build:</th>
         <td><a href="[% c.uri_for('/build' cachedBuild.id ) %]">[% cachedBuild.id %]</a></td>