eth: Make debug api trace errors more user friendly#15589
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Merge from ethereum/go-ethereum
fwd integration from ethereum master
add error type evaluation for errors that may return a MissingNodeError and return more friendly message for ethereum#15500
fjl
approved these changes
Dec 1, 2017
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Resolves #15500
effects eth.TraceTransaction and eth.traceBlock and thus by extension
functions such as eth.TraceBlockByHash, TraceBlockByNumber etc.
add error type evaluation for errors that may return a
trie.MissingNodeError so that they return more friendly message
"required historical state unavailable"