Fix monkey bug

    Bug: 5166733
    added missing return statements and valid active
    tab check

Change-Id: Ida7ffa6faf77a95eaf19ef566176ad522be4efef
diff --git a/src/com/android/browser/PhoneUi.java b/src/com/android/browser/PhoneUi.java
index d77fcdb..23d7abb 100644
--- a/src/com/android/browser/PhoneUi.java
+++ b/src/com/android/browser/PhoneUi.java
@@ -329,10 +329,12 @@
         final Tab tab = mNavScreen.getSelectedTab();
         if ((tab != null) && !animate) {
             finishAnimateOut(tab);
+            return;
         }
         NavTabView tabview = (NavTabView) mNavScreen.getSelectedTabView();
         if (tabview == null) {
             finishAnimateOut(tab);
+            return;
         }
         mUiController.setBlockEvents(true);
         mUiController.setActiveTab(tab);