Remove the white screen of welcome

If there's no home page configured, view the first room.

src/components/structures/LoggedInView.js

@@ -31,6 +31,7 @@ import sessionStore from '../../stores/SessionStore';
 import MatrixClientPeg from '../../MatrixClientPeg';
 import SettingsStore from "../../settings/SettingsStore";
 import RoomListStore from "../../stores/RoomListStore";
+import { getHomePageUrl } from '../../utils/pages';
 
 import TagOrderActions from '../../actions/TagOrderActions';
 import RoomListActions from '../../actions/RoomListActions';
@@ -459,17 +460,7 @@ const LoggedInView = React.createClass({
 
             case PageTypes.HomePage:
                 {
-                    const pagesConfig = this.props.config.embeddedPages;
-                    let pageUrl = null;
-                    if (pagesConfig) {
-                        pageUrl = pagesConfig.homeUrl;
-                    }
-                    if (!pageUrl) {
-                        // This is a deprecated config option for the home page
-                        // (despite the name, given we also now have a welcome
-                        // page, which is not the same).
-                        pageUrl = this.props.config.welcomePageUrl;
-                    }
+                    const pageUrl = getHomePageUrl(this.props.config);
                     pageElement = <EmbeddedPage className="mx_HomePage"
                         url={pageUrl}
                         scrollbar={true}

src/components/structures/MatrixChat.js

@@ -40,6 +40,7 @@ import * as Lifecycle from '../../Lifecycle';
 // LifecycleStore is not used but does listen to and dispatch actions
 require('../../stores/LifecycleStore');
 import PageTypes from '../../PageTypes';
+import { getHomePageUrl } from '../../utils/pages';
 
 import createRoom from "../../createRoom";
 import KeyRequestHandler from '../../KeyRequestHandler';
@@ -1198,8 +1199,12 @@ export default React.createClass({
         } else {
             if (MatrixClientPeg.get().isGuest()) {
                 dis.dispatch({action: 'view_welcome_page'});
-            } else {
+            } else if (getHomePageUrl(this.props.config)){
                 dis.dispatch({action: 'view_home_page'});
+            } else {
+                this.firstSyncPromise.promise.then(() => {
+                    dis.dispatch({action: 'view_next_room'});
+                });
             }
         }
     },

src/utils/pages.js

@@ -0,0 +1,31 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export function getHomePageUrl(appConfig) {
+    const pagesConfig = appConfig.embeddedPages;
+    let pageUrl = null;
+    if (pagesConfig) {
+        pageUrl = pagesConfig.homeUrl;
+    }
+    if (!pageUrl) {
+        // This is a deprecated config option for the home page
+        // (despite the name, given we also now have a welcome
+        // page, which is not the same).
+        pageUrl = appConfig.welcomePageUrl;
+    }
+
+    return pageUrl;
+}