Corrected crash from F8MapView (fbsamples#1)

When the user accesses for the first time without connection, and opens the Map tab, the app crashes and never recover (even with internet).

js/tabs/maps/F8MapView.js

@@ -48,18 +48,20 @@ class F8MapView extends React.Component {
 
   render() {
     const {map1, map2} = this.props;
+
+
     return (
       <View style={styles.container}>
         <ListContainer
           title="Maps"
           backgroundImage={require('./img/maps-background.png')}
           backgroundColor={'#9176D2'}>
           <PureListView
-            title={map1.name}
+            title='Overview'
             renderEmptyList={() => <MapView map={map1} />}
           />
           <PureListView
-            title={map2.name}
+            title='Developer Garage'
             renderEmptyList={() => <MapView map={map2} />}
           />
         </ListContainer>