fix default values for config and providers

web/app/components/auth-panel/auth-panel.jsx

@@ -2,7 +2,7 @@ import { h, Component } from 'preact';
 
 export default class AuthPanel extends Component {
   render(props, state) {
-    const { user, providers } = props;
+    const { user, providers = [] } = props;
 
     return (
       <div className={b('auth-panel', props)}>

web/app/components/root/root.jsx

@@ -86,7 +86,7 @@ export default class Root extends Component {
     });
   }
 
-  render({}, { config, comments = [], user, loaded }) {
+  render({}, { config = {}, comments = [], user, loaded }) {
     if (!loaded) {
       return (
         <div id={id}>