REST tx endpoint result status code should reflect success

[faboweb]

In the rest of the endpoints a not successful request produces a 4** status code. The tx endpoint returns a 200 but delivers some code in check_tx. I think this should be consistent through all the endpoints.

To reproduce try to bond with delegator with pubkey '88564A32500A120AA72CEFBCF5462E078E5DDB70B6431F59F778A8DC4DA719A4' on gaia-2-dev.

[ebuchman]

relevant for #324

[jbibla]

yep! i agree here. i’d rather see empty 200’s than 400 when a user doesn’t have a balance, for example. but should be consistent no matter what we choose.

[cwgoes]

I think this is no longer relevant, please re-open if otherwise.