RPC maker/start returns 409 error if no coins #1142
Merged
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Fixes #1120. As per the discussion in that issue, while
we can only return 'processing started' by default, and
the client must monitor progress/state to see if the maker
service has connected successfully, nevertheless if the
maker startup is immediately invalidated by the fact that
the already-synced wallet does not contain confirmed coins,
we can and should return an error message instead of a 202.
This commit does that, adding to the spec a 409-No-Coins
response type which indicates to the API client that the
setup of the maker failed for this specific reason.