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NullPointerException on empty value in currency-converted amount

See original GitHub issue

If no value is entered in the converted amount text box in the “Transfer funds” dialog, the application crashes with a NullPointerException:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.math.BigDecimal java.math.BigDecimal.setScale(int, java.math.RoundingMode)' on a null object reference
  at org.gnucash.android.model.Money.setAmount(Money.java:333)
  at org.gnucash.android.model.Money.<init>(Money.java:116)
  at org.gnucash.android.ui.transaction.dialog.TransferFundsDialogFragment.transferFunds(TransferFundsDialogFragment.java:226)
  at org.gnucash.android.ui.transaction.dialog.TransferFundsDialogFragment.access$100(TransferFundsDialogFragment.java:60)
  at org.gnucash.android.ui.transaction.dialog.TransferFundsDialogFragment$5.onClick(TransferFundsDialogFragment.java:180)
  at android.view.View.performClick(View.java:4802)
  at android.view.View$PerformClick.run(View.java:20101)
  at android.os.Handler.handleCallback(Handler.java:810)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loop(Looper.java:189)
  at android.app.ActivityThread.main(ActivityThread.java:5532)
  at java.lang.reflect.Method.invoke(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:372)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)

Steps to reproduce:

Create a new account with a different currency than the one configured.
Create a new transaction in some other account.
Enter a description and an amount.
Select the previously created account as transfer account. The transfer funds dialog will open.
Select “Converted Amount”.
Delete any value in the text box leaving it empty.
Press “Save”.
The application crashes.

Received as Crashlytics issue #205.