fix(welcome-page) Fix error before joining a meeting from welcome page

react/features/welcome/components/AbstractWelcomePage.js

@@ -274,7 +274,7 @@ export class AbstractWelcomePage<P: Props> extends Component<P, *> {
 export function _mapStateToProps(state: Object) {
     return {
         _calendarEnabled: isCalendarEnabled(state),
-        _deeplinkingCfg: state['features/base/config'].deeplinking,
+        _deeplinkingCfg: state['features/base/config'].deeplinking || {},
         _enableInsecureRoomNameWarning: state['features/base/config'].enableInsecureRoomNameWarning || false,
         _moderatedRoomServiceUrl: state['features/base/config'].moderatedRoomServiceUrl,
         _recentListEnabled: isRecentListEnabled(),

react/features/welcome/components/WelcomePage.web.js

@@ -346,14 +346,15 @@ class WelcomePage extends AbstractWelcomePage {
         const {
             t,
             _deeplinkingCfg: {
-                ios: { downloadLink: iosDownloadLink },
-                android: {
-                    fDroidUrl,
-                    downloadLink: androidDownloadLink
-                }
+                ios = {},
+                android = {}
             }
         } = this.props;
 
+        const { downloadLink: iosDownloadLink } = ios;
+
+        const { fDroidUrl, downloadLink: androidDownloadLink } = android;
+
         return (<footer className = 'welcome-footer'>
             <div className = 'welcome-footer-centered'>
                 <div className = 'welcome-footer-padded'>