Fix getTxByHash()

[adrianmurage]

The error message for this only returns the string "error" which isn't very descriptive. An error object with appropriate error codes and messages would be preferred. To enrich the error messages on the client side.

[linear]

DEM-66 Fix getTxByHash

The error message for this only returns the string "error" which isn't very descriptive

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[tcsenpai]

see DEM-91 for a possible solution