bug fix: when user hit `Unknown Contract Proposal` error the `Purchase` button will be kept disabled.
bug fix: when user hit `Unknown Contract Proposal` error the `Purchase` button will be kept disabled.

You can reproduce this by spamming the Purchase button.

There's usually a slight delay while next-gen purchases the contract; during this period the Purchase button should also be disabled.

nazaninreihani/binary-next-gen,nazaninreihani/binary-next-gen,binary-com/binary-next-gen,binary-com/binary-next-gen,binary-com/binary-next-gen,nazaninreihani/binary-next-gen