Insert EMPTY_DIVIDER LayoutType

Bug: 182503404
Test: manual
Change-Id: I126d95c66d69174978445f940f309dc4bf5ec537
diff --git a/searchuilib/src/com/android/app/search/LayoutType.java b/searchuilib/src/com/android/app/search/LayoutType.java
index 9661b7c..d53ba93 100644
--- a/searchuilib/src/com/android/app/search/LayoutType.java
+++ b/searchuilib/src/com/android/app/search/LayoutType.java
@@ -61,4 +61,7 @@
 
     // horizontal bar to be inserted between fallback search results and low confidence section
     public static final String DIVIDER = "divider";
+
+    // horizontal bar to be inserted between fallback search results and low confidence section
+    public static final String EMPTY_DIVIDER = "empty_divider";
 }