Fix ArrayIndexOutOfBoundsException, (issue 11038649)

Change-Id: Ib7aa55b104894f12175b382fdbcfb08d95408699
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index 0a15ecd..03e24c6 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -1050,7 +1050,7 @@
 
     protected void getOverviewModePages(int[] range) {
         range[0] = 0;
-        range[1] = getChildCount() - 1;
+        range[1] = Math.max(0, getChildCount() - 1);
     }
 
     protected void getVisiblePages(int[] range) {
@@ -1475,7 +1475,7 @@
     }
 
     public int getScrollForPage(int index) {
-        if (mPageScrolls == null || index >= mPageScrolls.length) {
+        if (mPageScrolls == null || index >= mPageScrolls.length || index < 0) {
             return 0;
         } else {
             return mPageScrolls[index];