Add an empty state for search

res/layout/conversation_list_fragment.xml

@@ -7,6 +7,16 @@
         android:layout_height="fill_parent"
         android:orientation="vertical">
 
+    <TextView android:id="@+id/empty_search"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:layout_marginTop="100dp"
+              android:gravity="center"
+              android:textSize="18sp"
+              android:padding="16dp"
+              android:visibility="invisible"
+              tools:text="No results found for 'foo'"/>
+
     <FrameLayout android:id="@+id/empty_state"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"

res/values/strings.xml

@@ -1493,6 +1493,7 @@
     <string name="conversation_list_fragment__give_your_inbox_something_to_write_home_about_get_started_by_messaging_a_friend">Give your inbox something to write home about. Get started by messaging a friend.</string>
     <string name="conversation_list_item_inbox_zero__inbox_zeeerrro">Inbox zeeerrro</string>
     <string name="conversation_list_item_inbox_zero__zip_zilch_zero_nada_nyou_re_all_caught_up">Zip. Zilch. Zero. Nada. You\'re all caught up!</string>
+    <string name="ConversationListFragment_no_results_found_for_s_">No results found for \'%s\'</string>
 
 
     <!-- EOF -->