Crashes: java.lang.NullPointerException com.alphawallet.app.ui.AddTokenActivity.onActivityResult

```
java.lang.RuntimeException:
at android.app.ActivityThread.deliverResults (ActivityThread.java:5864)
at android.app.ActivityThread.handleSendResult (ActivityThread.java:5903)
at android.app.servertransaction.ActivityResultItem.execute (ActivityResultItem.java:54)
at android.app.servertransaction.ActivityTransactionItem.execute (ActivityTransactionItem.java:45)
at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2438)
at android.os.Handler.dispatchMessage (Handler.java:106)
at android.os.Looper.loopOnce (Looper.java:226)
at android.os.Looper.loop (Looper.java:313)
at android.app.ActivityThread.main (ActivityThread.java:8669)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:571)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1135)
Caused by: java.lang.NullPointerException:
at com.alphawallet.app.ui.AddTokenActivity.onActivityResult (AddTokenActivity.java:401)
at android.app.Activity.dispatchActivityResult (Activity.java:8659)
at android.app.ActivityThread.deliverResults (ActivityThread.java:5857)
```