Fix crash on presplash screen if back button pressed

Mystic-Mirage · Mystic-Mirage · commit 4181e91f39ae · 2015-05-09T23:28:16.000+03:00
diff --git a/src/src/org/renpy/android/PythonActivity.java b/src/src/org/renpy/android/PythonActivity.java
@@ -333,8 +333,13 @@ public boolean onKeyUp(int keyCode, final KeyEvent event) {
     }
 
     protected void onDestroy() {
-        mPurchaseDatabase.close();
-        mBillingService.unbind();
+        if (mPurchaseDatabase != null) {
+            mPurchaseDatabase.close();
+        }
+
+        if (mBillingService != null) {
+            mBillingService.unbind();
+        }
 
         if (mView != null) {
             mView.onDestroy();
