fix crash on tablets

app/src/main/res/layout-w640dp/fragment_timeline.xml

@@ -1,20 +1,48 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="?attr/tab_page_margin_drawable">
 
-    <android.support.v4.widget.SwipeRefreshLayout
-        android:id="@+id/swipe_refresh_layout"
+    <android.support.constraint.ConstraintLayout
         android:layout_width="640dp"
         android:layout_height="match_parent"
         android:layout_gravity="center_horizontal"
         android:background="?attr/window_background">
 
-        <android.support.v7.widget.RecyclerView
-            android:id="@+id/recycler_view"
+        <android.support.v4.widget.SwipeRefreshLayout
+            android:id="@+id/swipe_refresh_layout"
             android:layout_width="match_parent"
-            android:layout_height="match_parent" />
-    </android.support.v4.widget.SwipeRefreshLayout>
+            android:layout_height="match_parent">
 
+            <android.support.v7.widget.RecyclerView
+                android:id="@+id/recycler_view"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent" />
+
+        </android.support.v4.widget.SwipeRefreshLayout>
+
+        <ProgressBar
+            android:id="@+id/progress_bar"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <TextView
+            android:id="@+id/nothing_message"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:drawablePadding="16dp"
+            android:text="@string/footer_empty"
+            android:textAlignment="center"
+            android:textSize="?attr/status_text_medium"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+    </android.support.constraint.ConstraintLayout>
 </FrameLayout>