Fix JSONException with test orders

[mullpav]

Same fix as here: https://github.com/anjlab/android-inapp-billing-v3/pull/99/files

[RomanZhilich]

Hm.. If order id is null, doesn't it mean that purchase is broken? I'm pretty sure this field is mandatory.

EDIT: Oh, sorry. I see it's for test purchases. But then there should be some way to distinguish test purchases from regular ones.

[mullpav]

Thanks for a response.
Here (http://developer.android.com/google/play/billing/billing_testing.html) is the following note:
Note: For test subscription purchases, leave the orderId field blank. You can use the purchaseToken field to identify test purchases.

[RomanZhilich]

Thanks for your fix. I'll think a bit about adding some sort of test mode and merge this commit. There's few other fixes I wanted to add so expect it in a week or so.

Also it might be more convenient to pull request in dev branch.

[mullpav]

Great, thank you!

Oh, sorry about the pull request in master branch, my fault.

[mullpav]

Hi, any news regarding an integration of a/this fix for test orders? Thanks.

[RomanZhilich]

Aw snap. I got ill and then it totally got out of my head. I'll do tomorrow, for sure...

[RomanZhilich]

Can you please try this out and confirm it works.
Don't forget to set debug mode in GoogleBillingProvider.Builder

[mullpav]

Thank you, it works with google play test purchases with the .setDebugMode(true) set.

Just for check, without the debug mode it fails in the GoogleBillingProvider with "org.json.JSONException: orderId value is null." returning the Status.UNKNOWN_ERROR.