Bug 752172 - (Part 2) Protect against null selected tab in SiteIdentityPopup. r=mfinkle

mobile/android/base/SiteIdentityPopup.java

@@ -80,7 +80,13 @@ public class SiteIdentityPopup extends PopupWindow {
     }
 
     public void show(int leftMargin) {
-        JSONObject identityData = Tabs.getInstance().getSelectedTab().getIdentityData();
+        Tab selectedTab = Tabs.getInstance().getSelectedTab();
+        if (selectedTab == null) {
+            Log.e(LOGTAG, "Selected tab is null");
+            return;
+        }
+
+        JSONObject identityData = selectedTab.getIdentityData();
         if (identityData == null) {
             Log.e(LOGTAG, "Tab has no identity data");
             return;