error in feature_fedpeg.py

[instagibbs]

    txid2 = sidechain2.sendrawtransaction(pegin_signed2["hex"])
  File "/home/travis/build/ElementsProject/elements/build/elements-x86_64-unknown-linux-gnu/test/functional/test_framework/coverage.py", line 47, in __call__
    return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
  File "/home/travis/build/ElementsProject/elements/build/elements-x86_64-unknown-linux-gnu/test/functional/test_framework/authproxy.py", line 136, in __call__
    raise JSONRPCException(response['error'])
test_framework.authproxy.JSONRPCException: Missing inputs (-25)

this is mysterious. It should just be a peg-in input? Trying to reproduce now.

[instagibbs]

#728 is further investigation