Bug 1321981 - [RTL] ViewPager Support - part 3. Skip set current item if adapter is empty, r=sebastian

MozReview-Commit-ID: L82yxhdG5bd

--HG--
extra : rebase_source : 71615c37c4e5b4abc67d2eb92a6e4662dc59b149

mobile/android/thirdparty/com/booking/rtlviewpager/RtlViewPager.java

@@ -129,7 +129,7 @@ public class RtlViewPager extends ViewPager {
             registerRtlDataSetObserver(adapter);
         }
         super.setAdapter(adapter);
-        if (rtlReady) {
+        if (rtlReady && adapter.getCount() > 0) {
             setCurrentItemWithoutNotification(0);
         }
     }