[som] Render alerts that don't have extensions.

go/src/infra/appengine/sheriff-o-matic/test/som-extension-build-failure-test.html

 <meta charset="utf-8">
 <script src="/bower_components/webcomponentsjs/webcomponents.min.js"></script>
 <script src="/bower_components/web-component-tester/browser.js"></script>
 <link rel="import" href="/bower_components/iron-test-helpers/iron-test-helpers.html">
 <link rel="import" href="/elements/som-extension-build-failure.html">
 <test-fixture id="basic">
   <template>
     <som-extension-build-failure></som-extension-build-failure>
   </template>
 </test-fixture>
@@ skipping 30 matching lines @@
         reasons: [{
           "step": "wekbit_tests",
           "test_names": [
             "best_test",
           ],
         }],
       };
       element._uberify = (url) => { return url; };
       flush( () => {
         let itm = element.$$("#test_results");
-        assert.isDefined(itm);
+        assert.isNotNull(itm);
         assert.equal(
             itm.children[0].href,
             "https://test-results.appspot.com/dashboards/flakiness_dashboard" +
             ".html#tests=best_test&testType=wekbit_tests");
         done();
       });
 
     });
+
+    test('renders suspect CLs', function(done) {
+      element.extension = {
+        reasons: [{
+          "step": "wekbit_tests",
+          "test_names": [
+            "best_test",
+          ],
+        }],
+        suspected_cls: [
+          {revision: '1234'},
+        ],
+      };
+      element._uberify = (url) => { return url; };
+      flush( () => {
+        let itm = element.$$("#findit-results");
+        assert.isNotNull(itm);
+        assert.equal(
+            itm.children[1].href, "https://crrev.com/1234");
+        done();
+      });
+
+    });
   });
 })();
 </script>