do not clear the proof argument in check_proof
do not clear the proof argument in check_proof

check_proof did clear the proof argument. There's no good reason to do
that and it's just waiting to bite you. One of the tests in
test_mtree.py already compares empty lists...

So, don't modify the proof argument.

hackaugusto/raiden,tomaaron/raiden,tomashaber/raiden,tomaaron/raiden,tomaaron/raiden,charles-cooper/raiden,tomaaron/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,hackaugusto/raiden,tomashaber/raiden,charles-cooper/raiden