Quorum doesn't return a message error clearly specifying the cause of an error (from a user standpoint) when the transaction manager fails to Quorum (e.g: 400 bad request, ...).

System information

Release: 2.2.3

Expected behaviour

Helpful error message

Actual behaviour

invalid argument 0: json: cannot unmarshal non-string into Go value of type common.Hash

Balance sheet column headings should be the column's end date:

Balance Sheet 2020-07-03

                                      ||                                   2020-07-03
======================================++==============================================

But in the HTML output, it seems to be a date range instead:

Problem

Once one has reproduced an abi test failure, there's this suggestion in the log output (just an example):
Confirm the diff by rerunning before and after this test failed with SOLANA_ABI_DUMP_DIR!', runtime/src/serde_snapshot/tests.rs:285:5

Proposed Solution

Three suggestions:

1. have the tests make the DUMP_DIR directory if the env var is set. When the variable is s

this is the natural behavior of node-hid but we should backport this behavior to all other transports.

basically it's a failsafe for race conditions.

if you open() a transport, you are responsible to close() it in a finally, if an open() happens during that time it should throw if it concerns the same device (e.g. by path id / by uuid, ... depending on the transport)