Login is false when network fails

getLoggedIn catches errors and it returns false on being logged in.
Gr-router preheat getLoggedIn and we want to return result in any case

Change-Id: I8454f89bced801da7e9a0f287c8fb6e2c5446dc5

polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js

@@ -1095,6 +1095,8 @@
     getLoggedIn() {
       return this.getAccount().then(account => {
         return account != null;
+      }).catch(() => {
+        return false;
       });
     },
 

polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.html

@@ -494,6 +494,15 @@ limitations under the License.
       });
     });
 
+    test('getLoggedIn returns false when network/auth failure', done => {
+      window.fetch.returns(
+          Promise.reject(new Error('Failed to fetch')));
+      element.getLoggedIn().then(isLoggedIn => {
+        assert.isFalse(isLoggedIn);
+        done();
+      });
+    });
+
     test('checkCredentials', done => {
       const responses = [
         {