Hide indication bar if only one page

Bug: 10923117
Change-Id: If81bf07ba2e7c4fff44a8832f98b4a393c15edc7

java/src/com/android/inputmethod/keyboard/EmojiCategoryPageIndicatorView.java

@@ -50,8 +50,9 @@ public class EmojiCategoryPageIndicatorView extends LinearLayout {
 
     @Override
     protected void onDraw(Canvas canvas) {
-        if (mCategoryPageSize == 0) {
+        if (mCategoryPageSize <= 1) {
-            // If the category is not set yet, just clear and return.
+            // If the category is not set yet or contains only one category,
+            // just clear and return.
             canvas.drawColor(0);
             return;
         }