Issue #3593063: Catch DeclineException/PaymentGatewayException in...

Andy Gilesrequested to merge
issue/commerce-3593063:3593063-orderpaymentaddform-does-not into 3.x

Issue #3593063: Catch DeclineException/PaymentGatewayException in OrderPaymentAddForm to avoid a WSOD on declined payments

Closes #3593063

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